void InsertChild( LayoutItem child )
{
// Store created node for child
Interop.FlexLayout.FlexLayout_AddChildWithMargin(swigCPtr, View.getCPtr(child.Owner), Extents.getCPtr(child.Owner.Margin), measureChildDelegate, LayoutChildren.Count-1);
}
/// <summary>
/// Callback when child is added to container.<br />
/// Derived classes can use this to set their own child properties on the child layout's owner.<br />
/// </summary>
/// <param name="child">The Layout child.</param>
/// <since_tizen> 6 </since_tizen>
protected override void OnChildAdd(LayoutItem child)
{
InsertChild(child);
}
// Virtual Methods that can be overridden by derived classes.
/// <summary>
/// Callback when child is added to container.<br />
/// Derived classes can use this to set their own child properties on the child layout's owner.<br />
/// </summary>
/// <param name="child">The Layout child.</param>
/// <since_tizen> 6 </since_tizen>
protected virtual void OnChildAdd(LayoutItem child)
{
}
/// <summary>
/// Callback when child is removed from container.<br />
/// </summary>
/// <param name="child">The Layout child.</param>
/// <since_tizen> 6 </since_tizen>
protected virtual void OnChildRemove(LayoutItem child)
{
}
} // MeasureVertical
private void LayoutHorizontal(LayoutLength left, LayoutLength top, LayoutLength right, LayoutLength bottom)
{
bool isLayoutRtl = Owner.LayoutDirection == ViewLayoutDirectionType.RTL;
LayoutLength childTop = new LayoutLength(Padding.Top);
LayoutLength childLeft = new LayoutLength(Padding.Start);
// Where bottom of child should go
LayoutLength height = new LayoutLength(bottom - top);
// Space available for child
LayoutLength childSpace = new LayoutLength(height - Padding.Top - Padding.Bottom);
int count = LayoutChildren.Count;
switch (LinearAlignment)
{
case Alignment.End:
// totalLength contains the padding already
// In case of RTL map END alignment to the left edge
if (isLayoutRtl)
{
childLeft = new LayoutLength(Padding.Start);
}
else
{
childLeft = new LayoutLength(Padding.Start + right.AsDecimal() - left.AsDecimal() - _totalLength);
}
break;
case Alignment.CenterHorizontal: // FALL THROUGH
case Alignment.Center:
// totalLength contains the padding already
childLeft = new LayoutLength(Padding.Start + (right.AsDecimal() - left.AsDecimal() - _totalLength) / 2.0f);
break;
case Alignment.Begin: // FALL THROUGH (default)
default:
// totalLength contains the padding already
// In case of RTL map BEGIN alignment to the right edge
if (isLayoutRtl)
{
childLeft = new LayoutLength(Padding.Start + right.AsDecimal() - left.AsDecimal() - _totalLength);
}
else
{
childLeft = new LayoutLength(Padding.Start);
}
break;
}
int start = 0;
int dir = 1;
// In case of RTL, start drawing from the last child.
if (isLayoutRtl)
{
start = count - 1;
dir = -1;
}
for (int i = 0; i < count; i++)
{
int childIndex = start + dir * i;
// Get a reference to the childLayout at the given index
LayoutItem childLayout = LayoutChildren[childIndex];
if (childLayout != null)
{
LayoutLength childWidth = childLayout.MeasuredWidth.Size;
LayoutLength childHeight = childLayout.MeasuredHeight.Size;
Extents childMargin = childLayout.Margin;
switch (LinearAlignment)
{
case Alignment.Bottom:
childTop = new LayoutLength(height - Padding.Bottom - childHeight - childMargin.Bottom);
break;
case Alignment.CenterVertical:
case Alignment.Center: // FALLTHROUGH
childTop = new LayoutLength(Padding.Top + ((childSpace - childHeight).AsDecimal() / 2.0f) + childMargin.Top - childMargin.Bottom);
break;
case Alignment.Top: // FALLTHROUGH default
default:
childTop = new LayoutLength(Padding.Top + childMargin.Top);
break;
}
childLeft += childMargin.Start;
childLayout.Layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);
childLeft += childWidth + childMargin.End + CellPadding.Width;
}
}
} // LayoutHorizontally
/// <inheritdoc/>
/// <since_tizen> 9 </since_tizen>
protected override void OnMeasure(MeasureSpecification widthMeasureSpec, MeasureSpecification heightMeasureSpec)
{
MeasuredSize.StateType childWidthState = MeasuredSize.StateType.MeasuredSizeOK;
MeasuredSize.StateType childHeightState = MeasuredSize.StateType.MeasuredSizeOK;
for (int i = 0; i < LayoutChildren.Count; i++)
{
LayoutItem childLayout = LayoutChildren[i];
if (childLayout != null)
{
MeasureChildWithMargins(childLayout, widthMeasureSpec, new LayoutLength(0), heightMeasureSpec, new LayoutLength(0));
if (childLayout.MeasuredWidth.State == MeasuredSize.StateType.MeasuredSizeTooSmall)
{
childWidthState = MeasuredSize.StateType.MeasuredSizeTooSmall;
}
if (childLayout.MeasuredHeight.State == MeasuredSize.StateType.MeasuredSizeTooSmall)
{
childHeightState = MeasuredSize.StateType.MeasuredSizeTooSmall;
}
}
}
(float childrenWidth, float childrenHeight) = CalculateChildrenSize(widthMeasureSpec.Size.AsDecimal(), heightMeasureSpec.Size.AsDecimal());
SetMeasuredDimensions(ResolveSizeAndState(new LayoutLength(childrenWidth), widthMeasureSpec, childWidthState),
ResolveSizeAndState(new LayoutLength(childrenHeight), heightMeasureSpec, childHeightState));
// There are 2 cases which require to calculate children's MeasuredWidth/Height as follows.
//
// 1. Text with Ellipsis true
// TextLabel and TextField calculate MeasuredWidth/Height to cover their text string if they have WrapContent.
// This causes children's Ellipsis cannot be displayed with RelativeLayout.
// To resolve the above, RelativeLayout recalculates its children's MeasuredWidth/Height based on the children's space calculated by RelativeLayout APIs.
//
// 2. FillHorizontal/Vertical true
// If children set FillHorizontal/Vertical true, then children's MeasuredWidth/Height are not correctly alculated.
// Instead, children's size and position are correctly calculated in OnLayout().
// This causes that the grand children's MeasuredWidth/Height are calculated incorrectly.
// To resolve the above, RelativeLayout calculates its children's MeasuredWidth/Height based on the children's geometry calculated by RelativeLayout APIs.
//
// e.g.
// Let parent have RelativeLayout and parent's size be 1920x1080.
// Let child have WrapContent with SetFillHorizontal/Vertical true.
// Let grand child have MatchParent.
// Then, child's size is 1920x1080 but child's MeasuredWidth/Height is 0x0.
// Then, grand child's MeasuredWidth/Height is 0x0 and size is 0x0.
//
// TODO: Not to do duplicate operations in OnLayout() again.
bool needClearCache = false;
for (int i = 0; i < LayoutChildren.Count; i++)
{
LayoutItem childLayout = LayoutChildren[i];
if (childLayout != null)
{
bool ellipsisText = false;
bool needMeasuredWidth = false;
bool needMeasuredHeight = false;
if (((childLayout.Owner is TextLabel textLabel) && textLabel.Ellipsis) || ((childLayout.Owner is TextField textField) && textField.Ellipsis))
{
ellipsisText = true;
needClearCache = true;
}
else
{
if (RelativeLayout.GetFillHorizontal(childLayout.Owner))
{
needMeasuredWidth = true;
needClearCache = true;
}
if (RelativeLayout.GetFillVertical(childLayout.Owner))
{
needMeasuredHeight = true;
needClearCache = true;
}
}
if ((ellipsisText == false) && (needMeasuredWidth == false) && (needMeasuredHeight == false))
{
continue;
}
float width = childLayout.MeasuredWidth.Size.AsDecimal();
float height = childLayout.MeasuredWidth.Size.AsDecimal();
if (ellipsisText)
{
Geometry horizontalSpace = GetHorizontalSpace(childLayout.Owner);
if ((width > horizontalSpace.Size) || ((width < horizontalSpace.Size) && RelativeLayout.GetFillVertical(childLayout.Owner)))
{
width = horizontalSpace.Size;
}
Geometry verticalSpace = GetVerticalSpace(childLayout.Owner);
if ((height > verticalSpace.Size) || ((height < verticalSpace.Size) && RelativeLayout.GetFillHorizontal(childLayout.Owner)))
{
height = verticalSpace.Size;
}
}
else
{
if (needMeasuredWidth)
{
Geometry horizontalGeometry = GetHorizontalLayout(childLayout.Owner);
width = horizontalGeometry.Size;
}
if (needMeasuredHeight)
{
Geometry verticalGeometry = GetVerticalLayout(childLayout.Owner);
height = verticalGeometry.Size;
}
}
// Padding sizes are added because Padding sizes will be subtracted in MeasureChild().
MeasureSpecification childWidthMeasureSpec = new MeasureSpecification(new LayoutLength(width + Padding.Start + Padding.End), MeasureSpecification.ModeType.Exactly);
MeasureSpecification childHeightMeasureSpec = new MeasureSpecification(new LayoutLength(height + Padding.Top + Padding.Bottom), MeasureSpecification.ModeType.Exactly);
// To calculate the grand children's Measure() with the mode type Exactly,
// children's Measure() is called with MatchParent if the children have WrapContent.
//
// i.e.
// If children have Wrapcontent and the grand children have MatchParent,
// then grand children's MeasuredWidth/Height do not fill the children
// because the grand children's Measure() is called with the mode type AtMost.
int origWidthSpecification = childLayout.Owner.WidthSpecification;
int origHeightSpecification = childLayout.Owner.HeightSpecification;
if (ellipsisText || needMeasuredWidth)
{
origWidthSpecification = childLayout.Owner.WidthSpecification;
childLayout.Owner.WidthSpecification = LayoutParamPolicies.MatchParent;
}
if (ellipsisText || needMeasuredHeight)
{
origHeightSpecification = childLayout.Owner.HeightSpecification;
childLayout.Owner.HeightSpecification = LayoutParamPolicies.MatchParent;
}
MeasureChildWithMargins(childLayout, childWidthMeasureSpec, new LayoutLength(0), childHeightMeasureSpec, new LayoutLength(0));
if (ellipsisText || needMeasuredWidth)
{
childLayout.Owner.WidthSpecification = origWidthSpecification;
}
if (ellipsisText || needMeasuredHeight)
{
childLayout.Owner.HeightSpecification = origHeightSpecification;
}
}
}
public GridChild(LayoutItem layoutItem, Node column, Node row)
{
LayoutItem = layoutItem;
Column = column;
Row = row;
}
private void MeasureHorizontal(MeasureSpecification widthMeasureSpec, MeasureSpecification heightMeasureSpec)
{
var widthMode = widthMeasureSpec.Mode;
var heightMode = heightMeasureSpec.Mode;
bool isExactly = (widthMode == MeasureSpecification.ModeType.Exactly);
bool matchHeight = false;
bool allFillParent = true;
float maxHeight = 0.0f;
float alternativeMaxHeight = 0.0f;
float weightedMaxHeight = 0.0f;
float totalWeight = 0.0f;
// Reset measure variables
_totalLength = 0.0f;
float usedExcessSpace = 0.0f;
HeightAndWidthState childState = new HeightAndWidthState(MeasuredSize.StateType.MeasuredSizeOK,
MeasuredSize.StateType.MeasuredSizeOK);
// 1st phase:
// We cycle through all children and measure children with weight 0 (non weighted children) according to their specs
// to accumulate total used space in totalLength based on measured sizes and margins.
// Weighted children are not measured at this phase.
// Available space for weighted children will be calculated in the phase 2 based on totalLength value.
// Max height of children is stored.
foreach (LayoutItem childLayout in LayoutChildren)
{
int childDesiredHeight = childLayout.Owner.HeightSpecification;
float childWeight = childLayout.Owner.Weight;
Extents childMargin = childLayout.Margin;
totalWeight += childWeight;
bool useExcessSpace = (childLayout.Owner.WidthSpecification == 0) && (childWeight > 0);
if (isExactly && useExcessSpace)
{
// Children to be laid out with excess space can be measured later
_totalLength += childMargin.Start + childMargin.End;
}
else
{
if (useExcessSpace)
{
// The widthMode is either Unspecified or AtMost, and
// this child is only laid out using excess space. Measure
// using WrapContent so that we can find out the view's
// optimal width.
MeasureSpecification childWidthMeasureSpec = GetChildMeasureSpecification(widthMeasureSpec,
new LayoutLength(childLayout.Padding.Start + childLayout.Padding.End),
new LayoutLength(LayoutParamPolicies.WrapContent));
MeasureSpecification childHeightMeasureSpec = GetChildMeasureSpecification(heightMeasureSpec,
new LayoutLength(childLayout.Padding.Top + childLayout.Padding.Bottom),
new LayoutLength(childDesiredHeight));
childLayout.Measure(childWidthMeasureSpec, childHeightMeasureSpec);
usedExcessSpace += childLayout.MeasuredWidth.Size.AsDecimal();
}
else
{
MeasureChild(childLayout, widthMeasureSpec, heightMeasureSpec);
}
LayoutLength childWidth = childLayout.MeasuredWidth.Size;
LayoutLength length = childWidth + childMargin.Start + childMargin.End;
if (isExactly)
{
_totalLength += length.AsDecimal();
}
else
{
_totalLength = Math.Max(_totalLength, _totalLength + length.AsDecimal() + CellPadding.Width);
}
}
bool matchHeightLocally = false;
if (heightMode != MeasureSpecification.ModeType.Exactly && childDesiredHeight == LayoutParamPolicies.MatchParent)
{
// A child has set to MatchParent on it's height.
// Will have to re-measure at least this child when we know exact height.
matchHeight = true;
matchHeightLocally = true;
}
float marginHeight = childMargin.Top + childMargin.Bottom;
float childHeight = childLayout.MeasuredHeight.Size.AsDecimal() + marginHeight;
if (childLayout.MeasuredWidth.State == MeasuredSize.StateType.MeasuredSizeTooSmall)
{
childState.widthState = MeasuredSize.StateType.MeasuredSizeTooSmall;
}
if (childLayout.MeasuredHeight.State == MeasuredSize.StateType.MeasuredSizeTooSmall)
{
childState.heightState = MeasuredSize.StateType.MeasuredSizeTooSmall;
}
maxHeight = Math.Max(maxHeight, childHeight);
allFillParent = (allFillParent && childDesiredHeight == LayoutParamPolicies.MatchParent);
if (childWeight > 0)
{
// Heights of weighted Views are invalid if we end up remeasuring, so store them separately.
weightedMaxHeight = Math.Max(weightedMaxHeight, matchHeightLocally ? marginHeight : childHeight);
}
else
{
alternativeMaxHeight = Math.Max(alternativeMaxHeight, matchHeightLocally ? marginHeight : childHeight);
}
} // foreach
Extents padding = Padding;
_totalLength += padding.Start + padding.End;
float widthSize = _totalLength;
widthSize = Math.Max(widthSize, SuggestedMinimumWidth.AsDecimal());
MeasuredSize widthSizeAndState = ResolveSizeAndState(new LayoutLength(widthSize), widthMeasureSpec, MeasuredSize.StateType.MeasuredSizeOK);
widthSize = widthSizeAndState.Size.AsDecimal();
// 2nd phase:
// Expand children with weight to take up available space
// We cycle through weighted children now (children with weight > 0).
// The children are measured with exact size equal to their share of the available space based on their weights.
// _totalLength is updated to include weighted children measured sizes.
float remainingExcess = widthSize - _totalLength + usedExcessSpace;
if (remainingExcess != 0 && totalWeight > 0)
{
float remainingWeight = totalWeight;
maxHeight = 0;
_totalLength = 0;
int numberOfChildren = LayoutChildren.Count;
for (int i = 0; i < numberOfChildren; ++i)
{
LayoutItem childLayout = LayoutChildren[i];
float desiredChildHeight = childLayout.Owner.HeightSpecification;
float childWeight = childLayout.Owner.Weight;
Extents childMargin = childLayout.Margin;
if (childWeight > 0)
{
MeasureWeightedChild(childLayout, remainingExcess, remainingWeight, childWeight,
widthMeasureSpec, heightMeasureSpec, childState,
Orientation.Horizontal);
}
float length = childLayout.MeasuredWidth.Size.AsDecimal() + childMargin.Start + childMargin.End;
float cellPadding = i < numberOfChildren - 1 ? CellPadding.Width : 0;
if (isExactly)
{
_totalLength += length;
}
else
{
float totalLength = _totalLength;
_totalLength = Math.Max(_totalLength, _totalLength + length + cellPadding);
}
bool matchHeightLocally = (heightMode != MeasureSpecification.ModeType.Exactly) && (desiredChildHeight == LayoutParamPolicies.MatchParent);
float marginHeight = childMargin.Top + childMargin.Bottom;
float childHeight = childLayout.MeasuredHeight.Size.AsDecimal() + marginHeight;
maxHeight = Math.Max(maxHeight, childHeight);
alternativeMaxHeight = Math.Max(alternativeMaxHeight, matchHeightLocally ? marginHeight : childHeight);
allFillParent = (allFillParent && desiredChildHeight == LayoutParamPolicies.MatchParent);
_totalLength += padding.Start + padding.End;
} // for loop
}
else
{
// No excess space or no weighted children
alternativeMaxHeight = Math.Max(alternativeMaxHeight, weightedMaxHeight);
}
if (!allFillParent && heightMode != MeasureSpecification.ModeType.Exactly)
{
maxHeight = alternativeMaxHeight;
}
maxHeight += padding.Top + padding.Bottom;
maxHeight = Math.Max(maxHeight, SuggestedMinimumHeight.AsRoundedValue());
widthSizeAndState.State = childState.widthState;
SetMeasuredDimensions(widthSizeAndState,
ResolveSizeAndState(new LayoutLength(maxHeight), heightMeasureSpec, childState.heightState));
if (matchHeight)
{
ForceUniformHeight(widthMeasureSpec);
}
} // MeasureHorizontal
protected override void OnMeasure(MeasureSpecification widthMeasureSpec, MeasureSpecification heightMeasureSpec)
{
var gridWidthMode = widthMeasureSpec.Mode;
var gridHeightMode = heightMeasureSpec.Mode;
int widthSize = (int)widthMeasureSpec.Size.AsRoundedValue();
int heightSize = (int)heightMeasureSpec.Size.AsRoundedValue();
int availableContentWidth;
int availableContentHeight;
int desiredChildHeight;
int desiredChildWidth;
Extents gridLayoutPadding = Padding;
var childCount = _children.Count;
// WIDTH SPECIFICATIONS
// measure first child and use it's dimensions for layout measurement
if (childCount > 0)
{
LayoutItem childLayoutItem = _children[0];
View childOwner = childLayoutItem.Owner;
MeasureChild(childLayoutItem, widthMeasureSpec, heightMeasureSpec);
desiredChildHeight = (int)childLayoutItem.MeasuredHeight.Size.AsRoundedValue();
desiredChildWidth = (int)childLayoutItem.MeasuredWidth.Size.AsRoundedValue();
// If child has a margin then add it to desired size
Extents childMargin = childLayoutItem.Margin;
desiredChildHeight += childMargin.Top + childMargin.Bottom;
desiredChildWidth += childMargin.Start + childMargin.End;
_totalWidth = desiredChildWidth * _columns;
// Include padding for max and min checks
_totalWidth += gridLayoutPadding.Start + gridLayoutPadding.End;
// Ensure width does not exceed specified at most width or less than mininum width
_totalWidth = Math.Max(_totalWidth, (int)SuggestedMinimumWidth.AsRoundedValue());
// widthMode EXACTLY so grid must be the given width
if (gridWidthMode == MeasureSpecification.ModeType.Exactly || gridWidthMode == MeasureSpecification.ModeType.AtMost)
{
// In the case of AT_MOST, widthSize is the max limit.
_totalWidth = Math.Min(_totalWidth, widthSize);
}
availableContentWidth = _totalWidth - gridLayoutPadding.Start - gridLayoutPadding.End;
widthSize = _totalWidth;
// HEIGHT SPECIFICATIONS
// heightMode EXACTLY so grid must be the given height
if (gridHeightMode == MeasureSpecification.ModeType.Exactly || gridHeightMode == MeasureSpecification.ModeType.AtMost)
{
if (childCount > 0)
{
_totalHeight = gridLayoutPadding.Top + gridLayoutPadding.Bottom;
for (int i = 0; i < childCount; i += _columns)
{
_totalHeight += desiredChildHeight;
}
// Ensure ourHeight does not exceed specified at most height
_totalHeight = Math.Min(_totalHeight, heightSize);
_totalHeight = Math.Max(_totalHeight, (int)SuggestedMinimumHeight.AsRoundedValue());
heightSize = _totalHeight;
} // Child exists
// In the case of AT_MOST, availableContentHeight is the max limit.
availableContentHeight = heightSize - gridLayoutPadding.Top - gridLayoutPadding.Bottom;
}
else
{
// Grid expands to fit content
// If number of columns AUTO_FIT then set to 1 column.
_columns = (_columns > 0) ? _columns : 1;
// Calculate numbers of rows, round down result as later check for remainder.
_rows = childCount / _columns;
// If number of cells not cleanly dividable by columns, add another row to house remainder cells.
_rows += (childCount % _columns > 0) ? 1 : 0;
availableContentHeight = desiredChildHeight * _rows;
}
// If number of columns not defined
DetermineNumberOfColumns(availableContentWidth);
// Locations define the start, end,top and bottom of each cell.
_locations.CalculateLocations(_columns, availableContentWidth, availableContentHeight, childCount);
} // Children exists
SetMeasuredDimensions(ResolveSizeAndState(new LayoutLength(widthSize), widthMeasureSpec, MeasuredSize.StateType.MeasuredSizeOK),
ResolveSizeAndState(new LayoutLength(heightSize), heightMeasureSpec, MeasuredSize.StateType.MeasuredSizeOK));
}
private void InitChildrenData(MeasureSpecification widthMeasureSpec, MeasureSpecification heightMeasureSpec)
{
int childCount = LayoutChildren.Count;
bool isHorizontal = (GridOrientation == Orientation.Horizontal);
int mainPivot = 0, subPivot = 0;
int[] pivotStack = new int[isHorizontal ? Columns : Rows];
vLocations = hLocations = null;
vEdgeList = hEdgeList = null;
gridChildren = new GridChild[childCount];
maxColumnConut = Columns;
maxRowCount = Rows;
totalVerticalExpand = 0;
totalHorizontalExpand = 0;
for (int i = 0; i < childCount; i++)
{
LayoutItem item = LayoutChildren[i];
View view = item?.Owner;
if (view == null)
{
continue;
}
int column, columnSpan, row, rowSpan;
StretchFlags verticalStretch, horizontalStretch;
column = GetColumn(view);
columnSpan = GetColumnSpan(view);
row = GetRow(view);
rowSpan = GetRowSpan(view);
verticalStretch = GetVerticalStretch(view);
horizontalStretch = GetHorizontalStretch(view);
if (column + columnSpan > Columns || row + rowSpan > Rows)
{
if (column + columnSpan > Columns)
{
Tizen.Log.Error("NUI", "Column + ColumnSapn exceeds Grid Columns. Column + ColumnSpan (" + column + " + " + columnSpan + ") > Grid Columns(" + Columns + ")");
}
else
{
Tizen.Log.Error("NUI", "Row + RowSapn exceeds Grid Rows. Row + RowSapn (" + row + " + " + rowSpan + ") > Grid Rows(" + Rows + ")");
}
gridChildren[i] = new GridChild(null, new Node(0, 1, 0, 0), new Node(0, 1, 0, 0));
continue;
}
if (horizontalStretch.HasFlag(StretchFlags.Expand))
{
totalHorizontalExpand++;
}
if (verticalStretch.HasFlag(StretchFlags.Expand))
{
totalVerticalExpand++;
}
// assign column/row depending on GridOrientation. The main axis count(Columns on Horizontal, Rows otherwise) won't be exceeded
// explicit column(row) count which is assigned by Columns(Rows). but, cross axis count(Rows(Columns)) can be increased by sub axis count.
if (column == CellUndefined || row == CellUndefined)
{
(int point, int span)mainAxis = isHorizontal ? (column, columnSpan) : (row, rowSpan);
(int point, int span)subAxis = isHorizontal ? (row, rowSpan) : (column, columnSpan);
if (subAxis.point != CellUndefined)
{
subPivot = subAxis.point;
}
if (mainAxis.point != CellUndefined)
{
mainPivot = mainAxis.point;
}
if (mainPivot + mainAxis.span > pivotStack.Length)
{
mainPivot = 0;
subPivot++;
}
for (int n = mainPivot + mainAxis.span - 1; n >= mainPivot; n--)
{
if (pivotStack[n] > subPivot)
{
mainPivot = n + 1;
n = mainPivot + mainAxis.span;
if (n > pivotStack.Length)
{
if (mainAxis.point != CellUndefined)
{
mainPivot = mainAxis.point;
}
else
{
mainPivot = 0;
}
n = mainPivot + mainAxis.span;
subPivot++;
}
}
}
if (isHorizontal)
{
column = mainPivot;
row = subPivot;
}
else
{
column = subPivot;
row = mainPivot;
}
for (int start = mainPivot, end = mainPivot + mainAxis.span; start < end; start++)
{
pivotStack[start] = subPivot + subAxis.span;
}
mainPivot += mainAxis.span;
}
if (maxColumnConut < column + columnSpan)
{
maxColumnConut = column + columnSpan;
}
if (maxRowCount < row + rowSpan)
{
maxRowCount = row + rowSpan;
}
MeasureChildWithMargins(item, widthMeasureSpec, new LayoutLength(0), heightMeasureSpec, new LayoutLength(0));
gridChildren[i] = new GridChild(item,
new Node(column, columnSpan, item.MeasuredWidth.Size.AsDecimal(), horizontalStretch),
new Node(row, rowSpan, item.MeasuredHeight.Size.AsDecimal(), verticalStretch));
}
}
/// <summary>
/// Measure the layout and its content to determine the measured width and the measured height.<br />
/// </summary>
/// <param name="widthMeasureSpec">horizontal space requirements as imposed by the parent.</param>
/// <param name="heightMeasureSpec">vertical space requirements as imposed by the parent.</param>
/// <since_tizen> 6 </since_tizen>
protected override void OnMeasure(MeasureSpecification widthMeasureSpec, MeasureSpecification heightMeasureSpec)
{
bool isLayoutRtl = Owner.LayoutDirection == ViewLayoutDirectionType.RTL;
Extents padding = Owner.Padding;
Extents margin = Owner.Margin;
Interop.FlexLayout.FlexLayout_SetMargin(swigCPtr, Extents.getCPtr(margin));
Interop.FlexLayout.FlexLayout_SetPadding(swigCPtr, Extents.getCPtr(padding));
float width = FlexUndefined; // Behaves as WrapContent (Flex Auto)
float height = FlexUndefined; // Behaves as WrapContent (Flex Auto)
if (widthMeasureSpec.Mode == MeasureSpecification.ModeType.Exactly || widthMeasureSpec.Mode == MeasureSpecification.ModeType.AtMost)
{
width = widthMeasureSpec.Size.AsDecimal();
}
if (heightMeasureSpec.Mode == MeasureSpecification.ModeType.Exactly || heightMeasureSpec.Mode == MeasureSpecification.ModeType.AtMost)
{
height = heightMeasureSpec.Size.AsDecimal();
}
// Save measureSpec to measure children.
// In other Layout, we can pass it as parameter to measuring child but in FlexLayout we can't
// because measurChild function is called by native callback.
parentMeasureSpecificationWidth = widthMeasureSpec;
parentMeasureSpecificationHeight = heightMeasureSpec;
// Assign child properties
for (int i = 0; i < LayoutChildren.Count; i++)
{
LayoutItem layoutItem = LayoutChildren[i];
View Child = layoutItem?.Owner;
HandleRef childHandleRef = (HandleRef)Child.GetValue(FlexItemProperty);
if (childHandleRef.Handle == IntPtr.Zero || Child == null)
{
continue;
}
AlignmentType flexAlignemnt = GetFlexAlignmentSelf(Child);
PositionType flexPosition = GetFlexPositionType(Child);
float flexAspectRatio = GetFlexAspectRatio(Child);
float flexBasis = GetFlexBasis(Child);
float flexShrink = GetFlexShrink(Child);
float flexGrow = GetFlexGrow(Child);
Interop.FlexLayout.FlexLayout_SetFlexAlignmentSelf(childHandleRef, (int)flexAlignemnt);
Interop.FlexLayout.FlexLayout_SetFlexPositionType(childHandleRef, (int)flexPosition);
Interop.FlexLayout.FlexLayout_SetFlexAspectRatio(childHandleRef, flexAspectRatio);
Interop.FlexLayout.FlexLayout_SetFlexBasis(childHandleRef, flexBasis);
Interop.FlexLayout.FlexLayout_SetFlexShrink(childHandleRef, flexShrink);
Interop.FlexLayout.FlexLayout_SetFlexGrow(childHandleRef, flexGrow);
}
Interop.FlexLayout.FlexLayout_CalculateLayout(swigCPtr, width, height, isLayoutRtl);
LayoutLength flexLayoutWidth = new LayoutLength(Interop.FlexLayout.FlexLayout_GetWidth(swigCPtr));
LayoutLength flexLayoutHeight = new LayoutLength(Interop.FlexLayout.FlexLayout_GetHeight(swigCPtr));
Debug.WriteLineIf(LayoutDebugFlex, "FlexLayout OnMeasure width:" + flexLayoutWidth.AsRoundedValue()
+ " height:" + flexLayoutHeight.AsRoundedValue());
SetMeasuredDimensions(GetDefaultSize(flexLayoutWidth, widthMeasureSpec),
GetDefaultSize(flexLayoutHeight, heightMeasureSpec));
}
/// <inheritdoc/>
/// <since_tizen> 9 </since_tizen>
protected override void OnMeasure(MeasureSpecification widthMeasureSpec, MeasureSpecification heightMeasureSpec)
{
MeasuredSize.StateType childWidthState = MeasuredSize.StateType.MeasuredSizeOK;
MeasuredSize.StateType childHeightState = MeasuredSize.StateType.MeasuredSizeOK;
for (int i = 0; i < LayoutChildren.Count; i++)
{
LayoutItem childLayout = LayoutChildren[i];
if (childLayout != null)
{
MeasureChildWithMargins(childLayout, widthMeasureSpec, new LayoutLength(0), heightMeasureSpec, new LayoutLength(0));
if (childLayout.MeasuredWidth.State == MeasuredSize.StateType.MeasuredSizeTooSmall)
{
childWidthState = MeasuredSize.StateType.MeasuredSizeTooSmall;
}
if (childLayout.MeasuredHeight.State == MeasuredSize.StateType.MeasuredSizeTooSmall)
{
childHeightState = MeasuredSize.StateType.MeasuredSizeTooSmall;
}
}
}
(float childrenWidth, float childrenHeight) = CalculateChildrenSize(widthMeasureSpec.Size.AsDecimal(), heightMeasureSpec.Size.AsDecimal());
SetMeasuredDimensions(ResolveSizeAndState(new LayoutLength(childrenWidth), widthMeasureSpec, childWidthState),
ResolveSizeAndState(new LayoutLength(childrenHeight), heightMeasureSpec, childHeightState));
// RelativeLayout sets its children's size in OnLayout().
// Therefore, the children's MeasuredWidth/Height are not the same with the children's size.
// This causes that the grand children's MeasuredWidth/Height are calculated incorrectly.
// To resolve the above, RelativeLayout updates its children's MeasuredWidth/Height after
// the RelativeLayout's MeasuredWidth/Height are calculated.
//
// e.g.
// Let parent have RelativeLayout and parent's size be 1920x1080.
// Let child have WrapContent with SetFillHorizontal/Vertical true.
// Let grand child have MatchParent.
// Then, child's size is 1920x1080 but child's MeasuredWidth/Height is 0x0.
// Then, grand child's MeasuredWidth/Height is 0x0 and size is 0x0.
//
// TODO: Not to do the following operation in OnLayout() again.
for (int i = 0; i < LayoutChildren.Count; i++)
{
LayoutItem childLayout = LayoutChildren[i];
if (childLayout != null)
{
LayoutLength childLeft;
LayoutLength childRight;
LayoutLength childTop;
LayoutLength childBottom;
if (childLayout.Owner.WidthSpecification == LayoutParamPolicies.MatchParent)
{
childLeft = new LayoutLength(childLayout.Margin.Start);
childRight = new LayoutLength(MeasuredWidth.Size.AsDecimal() - childLayout.Margin.End);
}
else
{
Geometry horizontalGeometry = GetHorizontalLayout(childLayout.Owner);
childLeft = new LayoutLength(horizontalGeometry.Position + Padding.Start + childLayout.Margin.Start);
childRight = new LayoutLength(horizontalGeometry.Position + horizontalGeometry.Size + Padding.Start - childLayout.Margin.End);
}
if (childLayout.Owner.HeightSpecification == LayoutParamPolicies.MatchParent)
{
childTop = new LayoutLength(childLayout.Margin.Top);
childBottom = new LayoutLength(MeasuredHeight.Size.AsDecimal() - childLayout.Margin.Bottom);
}
else
{
Geometry verticalGeometry = GetVerticalLayout(childLayout.Owner);
childTop = new LayoutLength(verticalGeometry.Position + Padding.Top + childLayout.Margin.Top);
childBottom = new LayoutLength(verticalGeometry.Position + verticalGeometry.Size + Padding.Top - childLayout.Margin.Bottom);
}
// Padding sizes are added because Padding sizes will be subtracted in MeasureChild().
MeasureSpecification childWidthMeasureSpec = new MeasureSpecification(new LayoutLength(childRight.AsDecimal() - childLeft.AsDecimal() + Padding.Start + Padding.End), MeasureSpecification.ModeType.Exactly);
MeasureSpecification childHeightMeasureSpec = new MeasureSpecification(new LayoutLength(childBottom.AsDecimal() - childTop.AsDecimal() + Padding.Top + Padding.Bottom), MeasureSpecification.ModeType.Exactly);
int origWidthSpecification = childLayout.Owner.WidthSpecification;
int origHeightSpecification = childLayout.Owner.HeightSpecification;
// To calculate the grand children's Measure() with the mode type Exactly,
// children's Measure() is called with MatchParent if the children have WrapContent.
//
// i.e.
// If children have Wrapcontent and the grand children have MatchParent,
// then grand children's MeasuredWidth/Height do not fill the children
// because the grand children's Measure() is called with the mode type AtMost.
if (childLayout.Owner.WidthSpecification == LayoutParamPolicies.WrapContent)
{
childLayout.Owner.WidthSpecification = LayoutParamPolicies.MatchParent;
}
if (childLayout.Owner.HeightSpecification == LayoutParamPolicies.WrapContent)
{
childLayout.Owner.HeightSpecification = LayoutParamPolicies.MatchParent;
}
// Use MeasureChild() because Margin sizes were already subtracted from childWidth/HeightMeasureSpec.
MeasureChild(childLayout, childWidthMeasureSpec, childHeightMeasureSpec);
childLayout.Owner.WidthSpecification = origWidthSpecification;
childLayout.Owner.HeightSpecification = origHeightSpecification;
}
}
}
internal void MeasureChildWithMarginsNative(LayoutItem child, LayoutMeasureSpec parentWidthMeasureSpec, LayoutLength widthUsed, LayoutMeasureSpec parentHeightMeasureSpec, LayoutLength heightUsed)
{
LayoutPINVOKE.LayoutGroupWrapperImpl_MeasureChildWithMarginsSwigExplicitLayoutGroupWrapperImpl(swigCPtr, LayoutItem.getCPtr(child), LayoutMeasureSpec.getCPtr(parentWidthMeasureSpec), LayoutLength.getCPtr(widthUsed), LayoutMeasureSpec.getCPtr(parentHeightMeasureSpec), LayoutLength.getCPtr(heightUsed));
if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
}
/// <summary>
/// Callback when child is removed from container.<br />
/// </summary>
/// <param name="child">The Layout child.</param>
/// <since_tizen> 6 </since_tizen>
protected override void OnChildRemove(LayoutItem child)
{
// When child View is removed from it's parent View (that is a Layout) then remove it from the layout too.
// FlexLayout refers to the child as a View not LayoutItem.
Interop.FlexLayout.FlexLayout_RemoveChild(swigCPtr, child);
}
/// <summary>
/// Ask one of the children of this view to measure itself, taking into
/// account both the MeasureSpec requirements for this view and its padding.<br />
/// The heavy lifting is done in GetChildMeasureSpec.<br />
/// </summary>
/// <param name="child">The child to measure.</param>
/// <param name="parentWidthMeasureSpec">The width requirements for this view.</param>
/// <param name="parentHeightMeasureSpec">The height requirements for this view.</param>
protected virtual void MeasureChild(LayoutItem child, LayoutMeasureSpec parentWidthMeasureSpec, LayoutMeasureSpec parentHeightMeasureSpec)
{
layoutGroupWrapperImpl.MeasureChildNative(child, parentWidthMeasureSpec, parentHeightMeasureSpec);
}
private void MeasureWeightedChild(LayoutItem childLayout, float remainingExcess, float remainingWeight, float childWeight,
MeasureSpecification widthMeasureSpec, MeasureSpecification heightMeasureSpec,
HeightAndWidthState childState, Orientation orientation)
{
bool horizontal = false;
if (orientation == Orientation.Horizontal)
{
horizontal = true;
}
float childsShare = (childWeight * remainingExcess) / remainingWeight;
remainingExcess -= childsShare;
remainingWeight -= childWeight;
float desiredWidth = childLayout.Owner.WidthSpecification;
float desiredHeight = childLayout.Owner.HeightSpecification;
float childLength = 0;
Extents layoutPadding = Padding;
// Always lay out weighted elements with intrinsic size regardless of the parent spec.
// for consistency between specs.
if ((horizontal && (desiredWidth == 0)) || (!horizontal && (desiredHeight == 0)))
{
// This child needs to be laid out from scratch using
// only its share of excess space.
childLength = childsShare;
}
else
{
// This child had some intrinsic width to which we
// need to add its share of excess space.
if (horizontal)
{
childLength = childLayout.MeasuredWidth.Size.AsDecimal() + childsShare;
}
else
{
childLength = childLayout.MeasuredHeight.Size.AsDecimal() + childsShare;
}
}
MeasureSpecification childWidthMeasureSpec;
MeasureSpecification childHeightMeasureSpec;
if (horizontal)
{
childWidthMeasureSpec = new MeasureSpecification(new LayoutLength(childLength), MeasureSpecification.ModeType.Exactly);
childHeightMeasureSpec = GetChildMeasureSpecification(heightMeasureSpec,
new LayoutLength(layoutPadding.Top + layoutPadding.Bottom),
new LayoutLength(desiredHeight));
}
else // vertical
{
childWidthMeasureSpec = GetChildMeasureSpecification(widthMeasureSpec,
new LayoutLength(Padding.Start + Padding.End),
new LayoutLength(desiredWidth));
childHeightMeasureSpec = new MeasureSpecification(new LayoutLength(childLength), MeasureSpecification.ModeType.Exactly);
}
childLayout.Measure(childWidthMeasureSpec, childHeightMeasureSpec);
// Child may now not fit in horizontal dimension.
if (childLayout.MeasuredWidth.State == MeasuredSize.StateType.MeasuredSizeTooSmall)
{
childState.widthState = MeasuredSize.StateType.MeasuredSizeTooSmall;
}
// Child may now not fit in vertical dimension.
if (childLayout.MeasuredHeight.State == MeasuredSize.StateType.MeasuredSizeTooSmall)
{
childState.heightState = MeasuredSize.StateType.MeasuredSizeTooSmall;
}
}
/// <summary>
/// Ask one of the children of this view to measure itself, taking into
/// account both the MeasureSpec requirements for this view and its padding.<br />
/// and margins. The child must have MarginLayoutParams The heavy lifting is
/// done in GetChildMeasureSpec.<br />
/// </summary>
/// <param name="child">The child to measure.</param>
/// <param name="parentWidthMeasureSpec">The width requirements for this view.</param>
/// <param name="widthUsed">Extra space that has been used up by the parent horizontally (possibly by other children of the parent).</param>
/// <param name="parentHeightMeasureSpec">The height requirements for this view.</param>
/// <param name="heightUsed">Extra space that has been used up by the parent vertically (possibly by other children of the parent).</param>
protected virtual void MeasureChildWithMargins(LayoutItem child, LayoutMeasureSpec parentWidthMeasureSpec, LayoutLength widthUsed, LayoutMeasureSpec parentHeightMeasureSpec, LayoutLength heightUsed)
{
layoutGroupWrapperImpl.MeasureChildWithMarginsNative(child, parentWidthMeasureSpec, widthUsed, parentHeightMeasureSpec, heightUsed);
}
} // MeasureHorizontal
private void MeasureVertical(MeasureSpecification widthMeasureSpec, MeasureSpecification heightMeasureSpec)
{
var widthMode = widthMeasureSpec.Mode;
var heightMode = heightMeasureSpec.Mode;
bool isExactly = (heightMode == MeasureSpecification.ModeType.Exactly);
bool matchWidth = false;
bool allFillParent = true;
float maxWidth = 0.0f;
float alternativeMaxWidth = 0.0f;
float weightedMaxWidth = 0.0f;
float totalWeight = 0.0f;
// Reset total length
_totalLength = 0.0f;
float usedExcessSpace = 0.0f;
HeightAndWidthState childState = new HeightAndWidthState(MeasuredSize.StateType.MeasuredSizeOK,
MeasuredSize.StateType.MeasuredSizeTooSmall);
// measure children, and determine if further resolution is required
// 1st phase:
// We cycle through all children and measure children with weight 0 (non weighted children) according to their specs
// to accumulate total used space in _totalLength.
// Weighted children are not measured in this phase.
// Available space for weighted children will be calculated in the phase 2 based on _totalLength value.
uint index = 0;
foreach (LayoutItem childLayout in LayoutChildren)
{
int childDesiredWidth = childLayout.Owner.WidthSpecification;
int childDesiredHeight = childLayout.Owner.HeightSpecification;
float childWeight = childLayout.Owner.Weight;
Extents childMargin = childLayout.Margin;
totalWeight += childWeight;
bool useExcessSpace = (childDesiredHeight == 0) && (childWeight > 0);
if (isExactly && useExcessSpace)
{
_totalLength = Math.Max(_totalLength, (_totalLength + childMargin.Top + childMargin.Bottom));
}
else
{
float childHeight = 0.0f;
if (useExcessSpace)
{
// The heightMode is either Unspecified or AtMost, and
// this child is only laid out using excess space. Measure
// using WrapContent so that we can find out the view's
// optimal height.
// We'll restore the original height of 0 after measurement.
MeasureSpecification childWidthMeasureSpec = GetChildMeasureSpecification(widthMeasureSpec,
new LayoutLength(childLayout.Padding.Start + childLayout.Padding.End),
new LayoutLength(childDesiredWidth));
MeasureSpecification childHeightMeasureSpec = GetChildMeasureSpecification(heightMeasureSpec,
new LayoutLength(childLayout.Padding.Top + childLayout.Padding.Bottom),
new LayoutLength(LayoutParamPolicies.WrapContent));
childLayout.Measure(childWidthMeasureSpec, childHeightMeasureSpec);
childHeight = childLayout.MeasuredHeight.Size.AsDecimal();
usedExcessSpace += childHeight;
}
else
{
MeasureChild(childLayout, widthMeasureSpec, heightMeasureSpec);
childHeight = childLayout.MeasuredHeight.Size.AsDecimal();
}
float length = childHeight + childMargin.Top + childMargin.Bottom;
float cellPadding = CellPadding.Height;
// No need to add cell padding to the end of last item.
if (index >= LayoutChildren.Count - 1)
{
cellPadding = 0.0f;
}
_totalLength = Math.Max(_totalLength, _totalLength + length + cellPadding);
}
bool matchWidthLocally = false;
if (widthMode != MeasureSpecification.ModeType.Exactly && (childDesiredWidth == LayoutParamPolicies.MatchParent))
{
// Will have to re-measure at least this child when we know exact height.
matchWidth = true;
matchWidthLocally = true;
}
float marginWidth = (childLayout.Margin.Start) + (childLayout.Margin.End);
float childWidth = childLayout.MeasuredWidth.Size.AsDecimal() + marginWidth;
if (childLayout.MeasuredWidth.State == MeasuredSize.StateType.MeasuredSizeTooSmall)
{
childState.widthState = MeasuredSize.StateType.MeasuredSizeTooSmall;
}
if (childLayout.MeasuredHeight.State == MeasuredSize.StateType.MeasuredSizeTooSmall)
{
childState.heightState = MeasuredSize.StateType.MeasuredSizeTooSmall;
}
maxWidth = Math.Max(maxWidth, childWidth);
allFillParent = (allFillParent && (childDesiredWidth == LayoutParamPolicies.MatchParent));
float widthforWeight = childWidth;
if (matchWidthLocally)
{
widthforWeight = marginWidth;
}
if (childWeight > 0)
{
// Widths of weighted Views are bogus if we end up remeasuring, so keep them separate.
weightedMaxWidth = Math.Max(weightedMaxWidth, widthforWeight);
}
else
{
alternativeMaxWidth = Math.Max(alternativeMaxWidth, widthforWeight);
}
index++;
} // foreach
Extents padding = Padding;
_totalLength += padding.Top + padding.Bottom;
LayoutLength heightSize = new LayoutLength(_totalLength);
heightSize = new LayoutLength(Math.Max(heightSize.AsDecimal(), SuggestedMinimumHeight.AsDecimal()));
MeasuredSize heightSizeAndState = ResolveSizeAndState(heightSize, heightMeasureSpec, MeasuredSize.StateType.MeasuredSizeOK);
heightSize = heightSizeAndState.Size;
// 2nd phase:
// We cycle through weighted children now (children with weight > 0).
// The children are measured with exact size equal to their share of the available space based on their weights.
// _totalLength is updated to include weighted children measured sizes.
float remainingExcess = heightSize.AsDecimal() - _totalLength + usedExcessSpace;
if (remainingExcess != 0 && totalWeight > 0.0f)
{
float remainingWeight = totalWeight;
_totalLength = 0;
int numberOfChildren = LayoutChildren.Count;
for (int i = 0; i < numberOfChildren; ++i)
{
LayoutItem childLayout = LayoutChildren[i];
float desiredChildWidth = childLayout.Owner.WidthSpecification;
float childWeight = childLayout.Owner.Weight;
Extents childMargin = childLayout.Margin;
if (childWeight > 0)
{
MeasureWeightedChild(childLayout, remainingExcess, remainingWeight, childWeight,
widthMeasureSpec, heightMeasureSpec, childState,
Orientation.Vertical);
}
bool matchWidthLocally = false;
if (widthMode != MeasureSpecification.ModeType.Exactly && desiredChildWidth == LayoutParamPolicies.MatchParent)
{
// Will have to re-measure at least this child when we know exact height.
matchWidth = true;
matchWidthLocally = true;
}
float marginWidth = childMargin.Start + childMargin.End;
float childWidth = childLayout.MeasuredWidth.Size.AsDecimal() + marginWidth;
maxWidth = Math.Max(maxWidth, childWidth);
allFillParent = allFillParent && desiredChildWidth == LayoutParamPolicies.MatchParent;
float childHeight = childLayout.MeasuredHeight.Size.AsDecimal();
float childLength = childHeight + childMargin.Top + childMargin.Bottom;
float cellPadding = i < numberOfChildren - 1 ? CellPadding.Height : 0.0f;
_totalLength = _totalLength + childLength + cellPadding;
alternativeMaxWidth = Math.Max(alternativeMaxWidth, matchWidthLocally ? marginWidth : childWidth);
} // for loop
// Add in our padding
_totalLength += padding.Top + padding.Bottom;
}
else
{
alternativeMaxWidth = Math.Max(alternativeMaxWidth, weightedMaxWidth);
}
if (!allFillParent && widthMode != MeasureSpecification.ModeType.Exactly)
{
maxWidth = alternativeMaxWidth;
}
maxWidth += padding.Start + padding.End;
maxWidth = Math.Max(maxWidth, SuggestedMinimumWidth.AsRoundedValue());
heightSizeAndState.State = childState.heightState;
SetMeasuredDimensions(ResolveSizeAndState(new LayoutLength(maxWidth), widthMeasureSpec, childState.widthState),
heightSizeAndState);
if (matchWidth)
{
ForceUniformWidth(heightMeasureSpec);
}
} // MeasureVertical
public static extern global::System.IntPtr FlexLayout_RemoveChild(global::System.Runtime.InteropServices.HandleRef jarg1, LayoutItem jarg2);
} // LayoutHorizontally
private void LayoutVertical(LayoutLength left, LayoutLength top, LayoutLength right, LayoutLength bottom)
{
LayoutLength childTop = new LayoutLength(Padding.Top);
LayoutLength childLeft = new LayoutLength(Padding.Start);
// Where end of child should go
LayoutLength width = new LayoutLength(right - left);
// Space available for child
LayoutLength childSpace = new LayoutLength(width - Padding.Start - Padding.End);
int count = LayoutChildren.Count;
switch (LinearAlignment)
{
case Alignment.Bottom:
// totalLength contains the padding already
childTop = new LayoutLength(Padding.Top + bottom.AsDecimal() - top.AsDecimal() - _totalLength);
break;
case Alignment.CenterVertical: // FALL THROUGH
case Alignment.Center:
// totalLength contains the padding already
childTop = new LayoutLength(Padding.Top + (bottom.AsDecimal() - top.AsDecimal() - _totalLength) / 2.0f);
break;
case Alignment.Top: // FALL THROUGH (default)
default:
// totalLength contains the padding already
childTop = new LayoutLength(Padding.Top);
break;
}
for (int i = 0; i < count; i++)
{
LayoutItem childLayout = LayoutChildren[i];
if (childLayout != null)
{
LayoutLength childWidth = childLayout.MeasuredWidth.Size;
LayoutLength childHeight = childLayout.MeasuredHeight.Size;
Extents childMargin = childLayout.Margin;
childTop += childMargin.Top;
switch (LinearAlignment)
{
case Alignment.Begin:
default:
{
childLeft = new LayoutLength(Padding.Start + childMargin.Start);
break;
}
case Alignment.End:
{
childLeft = new LayoutLength(width - Padding.End - childWidth - childMargin.End);
break;
}
case Alignment.CenterHorizontal:
case Alignment.Center: // FALL THROUGH
{
childLeft = new LayoutLength(Padding.Start + ((childSpace - childWidth).AsDecimal() / 2.0f) + childMargin.Start - childMargin.End);
break;
}
}
childLayout.Layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);
childTop += childHeight + childMargin.Bottom + CellPadding.Height;
}
}
} // LayoutVertical
/// <summary>
/// Add LayoutItem to a removal stack for removal after transitions finish.
/// </summary>
/// <param name="itemToRemove">LayoutItem to remove.</param>
internal void AddToRemovalStack(LayoutItem itemToRemove)
{
transitionManager.AddToRemovalStack(itemToRemove);
}