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;
int childrenCount = IterateLayoutChildren().Count();
// 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 IterateLayoutChildren())
{
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 = Math.Max(totalLength, (totalLength + childMargin.Start + childMargin.End));
}
else
{
if (useExcessSpace)
{
// Parent is not defined!!!
// 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(
new MeasureSpecification(
new LayoutLength(widthMeasureSpec.Size - (childLayout.Margin.Start + childLayout.Margin.End)),
widthMeasureSpec.Mode),
new LayoutLength(Padding.Start + Padding.End),
new LayoutLength(LayoutParamPolicies.WrapContent));
MeasureSpecification childHeightMeasureSpec = GetChildMeasureSpecification(
new MeasureSpecification(
new LayoutLength(heightMeasureSpec.Size - (childLayout.Margin.Top + childLayout.Margin.Bottom)),
heightMeasureSpec.Mode),
new LayoutLength(Padding.Top + Padding.Bottom),
new LayoutLength(childDesiredHeight));
childLayout.Measure(childWidthMeasureSpec, childHeightMeasureSpec);
usedExcessSpace += childLayout.MeasuredWidth.Size.AsDecimal();
}
else
{
MeasureChildWithMargins(childLayout, widthMeasureSpec, new LayoutLength(0), heightMeasureSpec, new LayoutLength(0));
}
LayoutLength childWidth = childLayout.MeasuredWidth.Size;
LayoutLength length = childWidth + childMargin.Start + childMargin.End;
totalLength = Math.Max(totalLength, totalLength + length.AsDecimal());
}
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
totalLength = Math.Max(totalLength, totalLength + CellPadding.Width * (childrenCount - 1));
float widthSize = totalLength;
widthSize = Math.Max(widthSize, SuggestedMinimumWidth.AsDecimal());
MeasuredSize widthSizeAndState = ResolveSizeAndState(new LayoutLength(widthSize + Padding.Start + Padding.End), 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 - (Padding.Start + Padding.End);
if (remainingExcess != 0 && totalWeight > 0)
{
float remainingWeight = totalWeight;
maxHeight = 0;
totalLength = 0;
foreach (LayoutItem childLayout in IterateLayoutChildren())
{
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;
totalLength += length;
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);
} // for loop
totalLength = Math.Max(totalLength, totalLength + CellPadding.Width * (childrenCount - 1));
}
else
{
// No excess space or no weighted children
alternativeMaxHeight = Math.Max(alternativeMaxHeight, weightedMaxHeight);
}
if (!allFillParent && heightMode != MeasureSpecification.ModeType.Exactly)
{
maxHeight = alternativeMaxHeight;
}
// Padding should be concerned when specification is Wrapcontent.
maxHeight += (Owner.HeightSpecification == LayoutParamPolicies.WrapContent) ? (Padding.Top + Padding.Bottom) : 0;
maxHeight = Math.Max(maxHeight, SuggestedMinimumHeight.AsRoundedValue());
widthSizeAndState.State = childState.widthState;
SetMeasuredDimensions(widthSizeAndState,
ResolveSizeAndState(new LayoutLength(maxHeight), heightMeasureSpec, childState.heightState));
if (matchHeight)
{
ForceUniformHeight(widthMeasureSpec);
}
} // MeasureHorizontal
/// <summary>
/// Performs the layouting positioning
/// </summary>
private void PerformLayout(View root, LayoutLength left, LayoutLength top, LayoutLength right, LayoutLength bottom)
{
root.Layout?.Layout(left, top, right, bottom);
}
/// <summary>
/// Layout should assign a size and position to each of its children.<br />
/// </summary>
/// <param name="changed">This is a new size or position for this layout.</param>
/// <param name="left">Left position, relative to parent.</param>
/// <param name="top"> Top position, relative to parent.</param>
/// <param name="right">Right position, relative to parent.</param>
/// <param name="bottom">Bottom position, relative to parent.</param>
/// <since_tizen> 6 </since_tizen>
protected override void OnLayout(bool changed, LayoutLength left, LayoutLength top, LayoutLength right, LayoutLength bottom)
{
if (linearOrientation == Orientation.Horizontal)
{
LayoutHorizontal(left, top, right, bottom);
}
else
{
LayoutVertical(left, top, right, bottom);
}
}
// Starts of the actual measuring and layouting from the given root node.
// Can be called from multiple starting roots but in series.
void MeasureAndLayout(View root)
{
if (root != null)
{
// Get parent MeasureSpecification, this could be the Window or View with an exact size.
Container parentNode = root.GetParent();
Size2D rootSize;
Position2D rootPosition = root.Position2D;
View parentView = parentNode as View;
if (parentView)
{
// Get parent View's Size. If using Legacy size negotiation then should have been set already.
rootSize = new Size2D(parentView.Size2D.Width, parentView.Size2D.Height);
}
else
{
// Parent not a View so assume it's a Layer which is the size of the window.
rootSize = new Size2D(_window.Size.Width, _window.Size.Height);
}
// Determine measure specification for root.
// The root layout policy could be an exact size, be match parent or wrap children.
// If wrap children then at most it can be the root parent size.
// If match parent then should be root parent size.
// If exact then should be that size limited by the root parent size.
LayoutLength width = new LayoutLength(rootSize.Width);
LayoutLength height = new LayoutLength(rootSize.Height);
MeasureSpecification.ModeType widthMode = MeasureSpecification.ModeType.AtMost;
MeasureSpecification.ModeType heightMode = MeasureSpecification.ModeType.AtMost;
if (root.WidthSpecification >= 0)
{
// exact size provided so match width exactly
width = new LayoutLength(root.WidthSpecification);
widthMode = MeasureSpecification.ModeType.Exactly;
}
else if (root.WidthSpecification == LayoutParamPolicies.MatchParent)
{
widthMode = MeasureSpecification.ModeType.Exactly;
}
if (root.HeightSpecification >= 0)
{
// exact size provided so match height exactly
height = new LayoutLength(root.HeightSpecification);
heightMode = MeasureSpecification.ModeType.Exactly;
}
else if (root.HeightSpecification == LayoutParamPolicies.MatchParent)
{
heightMode = MeasureSpecification.ModeType.Exactly;
}
MeasureSpecification parentWidthSpecification =
new MeasureSpecification(width, widthMode);
MeasureSpecification parentHeightSpecification =
new MeasureSpecification(height, heightMode);
// Start at root with it's parent's widthSpecification and heightSpecification
MeasureHierarchy(root, parentWidthSpecification, parentHeightSpecification);
// Start at root which was just measured.
PerformLayout(root, new LayoutLength(rootPosition.X),
new LayoutLength(rootPosition.Y),
new LayoutLength(rootPosition.X) + root.Layout.MeasuredWidth.Size,
new LayoutLength(rootPosition.Y) + root.Layout.MeasuredHeight.Size);
bool readyToPlay = SetupCoreAnimation();
if (readyToPlay && OverrideCoreAnimation == false)
{
PlayAnimation();
}
}
}
/// <summary>
/// Assign a size and position to each of its children.<br />
/// </summary>
/// <param name="changed">This is a new size or position for this layout.</param>
/// <param name="left">Left position, relative to parent.</param>
/// <param name="top"> Top position, relative to parent.</param>
/// <param name="right">Right position, relative to parent.</param>
/// <param name="bottom">Bottom position, relative to parent.</param>
/// <since_tizen> 6 </since_tizen>
protected override void OnLayout( bool changed, LayoutLength left, LayoutLength top, LayoutLength right, LayoutLength bottom )
{
bool isLayoutRtl = Owner.LayoutDirection == ViewLayoutDirectionType.RTL;
LayoutLength width = right - left;
LayoutLength height = bottom - top;
// Call to FlexLayout implementation to calculate layout values for later retrieval.
Interop.FlexLayout.FlexLayout_CalculateLayout( swigCPtr, width.AsDecimal(), height.AsDecimal(), isLayoutRtl );
int count = LayoutChildren.Count;
for( int childIndex = 0; childIndex < count; childIndex++)
{
LayoutItem childLayout = LayoutChildren[childIndex];
if( childLayout != null )
{
// Get the frame for the child, start, top, end, bottom.
Vector4 frame = new Vector4(Interop.FlexLayout.FlexLayout_GetNodeFrame(swigCPtr, childIndex ), true);
childLayout.Layout( new LayoutLength(frame.X), new LayoutLength(frame.Y), new LayoutLength(frame.Z), new LayoutLength(frame.W) );
}
}
}
/// <summary>
/// Called from Layout() when this layout should assign a size and position to each of its children. <br />
/// Derived classes with children should override this method and call Layout() on each of their children. <br />
/// </summary>
/// <param name="changed">This is a new size or position for this layout.</param>
/// <param name="left">Left position, relative to parent.</param>
/// <param name="top">Top position, relative to parent.</param>
/// <param name="right">Right position, relative to parent.</param>
/// <param name="bottom">Bottom position, relative to parent.</param>
protected virtual void OnLayout(bool changed, LayoutLength left, LayoutLength top, LayoutLength right, LayoutLength bottom)
{
}
} // 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 + ((i < count - 1) ? CellPadding.Height : 0);
}
}
} // LayoutVertical
} // 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 + ((i < count - 1) ? CellPadding.Width : 0);
}
}
} // LayoutHorizontally
} // 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.MeasuredSizeOK);
// 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.
for (int i = 0; i < LayoutChildren.Count; i++)
{
LayoutItem childLayout = LayoutChildren[i];
int childDesiredWidth = childLayout.Owner.WidthSpecification;
float childWeight = childLayout.Owner.Weight;
Extents childMargin = childLayout.Margin;
totalWeight += childWeight;
bool useExcessSpace = (childLayout.Owner.HeightSpecification == 0) && (childWeight > 0);
if (isExactly && useExcessSpace)
{
totalLength = Math.Max(totalLength, (totalLength + childMargin.Top + childMargin.Bottom));
}
else
{
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(
new MeasureSpecification(
new LayoutLength(widthMeasureSpec.Size - (childLayout.Margin.Start + childLayout.Margin.End)),
widthMeasureSpec.Mode),
new LayoutLength(Padding.Start + Padding.End),
new LayoutLength(childDesiredWidth));
MeasureSpecification childHeightMeasureSpec = GetChildMeasureSpecification(
new MeasureSpecification(
new LayoutLength(heightMeasureSpec.Size - (childLayout.Margin.Top + childLayout.Margin.Bottom)),
heightMeasureSpec.Mode),
new LayoutLength(Padding.Top + Padding.Bottom),
new LayoutLength(LayoutParamPolicies.WrapContent));
childLayout.Measure(childWidthMeasureSpec, childHeightMeasureSpec);
usedExcessSpace += childLayout.MeasuredHeight.Size.AsDecimal();
}
else
{
MeasureChildWithMargins(childLayout, widthMeasureSpec, new LayoutLength(0), heightMeasureSpec, new LayoutLength(0));
}
LayoutLength childHeight = childLayout.MeasuredHeight.Size;
LayoutLength length = childHeight + childMargin.Top + childMargin.Bottom;
if (isExactly)
{
totalLength += length.AsDecimal();
}
else
{
totalLength = Math.Max(totalLength, totalLength + length.AsDecimal() + (i < LayoutChildren.Count - 1 ? CellPadding.Height : 0));
}
}
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);
if (childWeight > 0)
{
// Widths of weighted Views are bogus if we end up remeasuring, so keep them separate.
weightedMaxWidth = Math.Max(weightedMaxWidth, matchWidthLocally ? marginWidth : childWidth);
}
else
{
alternativeMaxWidth = Math.Max(alternativeMaxWidth, matchWidthLocally ? marginWidth : childWidth);
}
} // foreach
float heightSize = totalLength;
heightSize = Math.Max(heightSize, SuggestedMinimumHeight.AsDecimal());
MeasuredSize heightSizeAndState = ResolveSizeAndState(new LayoutLength(heightSize + Padding.Top + Padding.Bottom), heightMeasureSpec, MeasuredSize.StateType.MeasuredSizeOK);
heightSize = heightSizeAndState.Size.AsDecimal();
// 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 - totalLength + usedExcessSpace - (Padding.Top + Padding.Bottom);
if (remainingExcess != 0 && totalWeight > 0.0f)
{
float remainingWeight = totalWeight;
maxWidth = 0;
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);
}
float length = childLayout.MeasuredHeight.Size.AsDecimal() + childMargin.Top + childMargin.Bottom;
float cellPadding = i < numberOfChildren - 1 ? CellPadding.Height : 0;
if (isExactly)
{
totalLength += length;
}
else
{
float totalLength = this.totalLength;
totalLength = Math.Max(totalLength, totalLength + length + cellPadding);
}
bool matchWidthLocally = (widthMode != MeasureSpecification.ModeType.Exactly) && (desiredChildWidth == LayoutParamPolicies.MatchParent);
float marginWidth = childMargin.Start + childMargin.End;
float childWidth = childLayout.MeasuredWidth.Size.AsDecimal() + marginWidth;
maxWidth = Math.Max(maxWidth, childWidth);
alternativeMaxWidth = Math.Max(alternativeMaxWidth, matchWidthLocally ? marginWidth : childWidth);
allFillParent = (allFillParent && desiredChildWidth == LayoutParamPolicies.MatchParent);
} // for loop
}
else
{
alternativeMaxWidth = Math.Max(alternativeMaxWidth, weightedMaxWidth);
}
if (!allFillParent && widthMode != MeasureSpecification.ModeType.Exactly)
{
maxWidth = alternativeMaxWidth;
}
maxWidth += (Owner.WidthSpecification == LayoutParamPolicies.WrapContent) ? (Padding.Start + Padding.End) : 0;
maxWidth = Math.Max(maxWidth, SuggestedMinimumWidth.AsRoundedValue());
heightSizeAndState.State = childState.heightState;
SetMeasuredDimensions(ResolveSizeAndState(new LayoutLength(maxWidth + Padding.Top + Padding.Bottom), widthMeasureSpec, childState.widthState),
heightSizeAndState);
if (matchWidth)
{
ForceUniformWidth(heightMeasureSpec);
}
} // MeasureVertical
/// <inheritdoc/>
/// <since_tizen> 9 </since_tizen>
protected override void OnLayout(bool changed, LayoutLength left, LayoutLength top, LayoutLength right, LayoutLength bottom)
{
for (int i = 0; i < LayoutChildren.Count; i++)
{
LayoutItem childLayout = LayoutChildren[i];
if (childLayout != null)
{
Geometry horizontalGeometry = GetHorizontalLayout(childLayout.Owner);
Geometry verticalGeometry = GetVerticalLayout(childLayout.Owner);
// MeasureChildWithMargins() is called to assign child's MeasuredWidth/Height to calculate grand children's sizes correctly.
// Grand children's positions are calculated correctly only if their sizes are calculated correctly.
// MeasureChildWithMargins() should be called before childLayout.Layout() to use childLayout's MeasuredWidth/Height
// when the grand children's positions are calculated.
//
// FIXME: It would be better if MeasureChildWithMargins() are called in OnMeasure() to separate Measure and Layout calculations.
// For now, not to call duplicate GetHorizontalLayout() and GetVerticalLayout() in both OnMeasure() and OnLayout(),
// MeasureChildWithMargins() is called here.
MeasureChildWithMargins(childLayout,
new MeasureSpecification(new LayoutLength(horizontalGeometry.Size), MeasureSpecification.ModeType.Exactly), new LayoutLength(0),
new MeasureSpecification(new LayoutLength(verticalGeometry.Size), MeasureSpecification.ModeType.Exactly), new LayoutLength(0));
LayoutLength childLeft = new LayoutLength(horizontalGeometry.Position + Padding.Start + childLayout.Margin.Start);
LayoutLength childRight = new LayoutLength(horizontalGeometry.Position + horizontalGeometry.Size + Padding.Start - childLayout.Margin.End);
LayoutLength childTop = new LayoutLength(verticalGeometry.Position + Padding.Top + childLayout.Margin.Top);
LayoutLength childBottom = new LayoutLength(verticalGeometry.Position + verticalGeometry.Size + Padding.Top - childLayout.Margin.Bottom);
childLayout.Layout(childLeft, childTop, childRight, childBottom);
}
}
HorizontalRelativeCache.Clear();
VerticalRelativeCache.Clear();
}
