private void RecalculateGrid()
{
_queueResize = false;
DLog("Resizing grid");
if (EnablePaging)
{
gridPaging.Visibility = Visibility.Visible;
txtPageText.Text = "Page " + (CurrentPage+1).ToString();
} else
{
gridPaging.Visibility = Visibility.Collapsed;
}
double canvasWidth = canvasButtons.ActualWidth;
double canvasHeight = canvasButtons.ActualHeight;
int numExistingSlots = _slotPlaceholders.Count;
double minButtonWidth = MinimumButtonWidth;
if (minButtonWidth < 10) { minButtonWidth = 10; }
int buttonsPerRow = Convert.ToInt32(System.Math.Floor(canvasWidth / minButtonWidth));
double buttonWidth = (canvasWidth / Convert.ToDouble(buttonsPerRow));
double buttonHeight = MinimumButtonHeight;
if (buttonHeight < 10) { buttonHeight = 10; }
int rowsPerPage = (Convert.ToInt32(System.Math.Floor(canvasHeight / buttonHeight)));
GridSlotsPerPage = buttonsPerRow * rowsPerPage;
double currentTop = 0;
double currentLeft = 0;
int row = 0;
int col = 0;
int index = CurrentPage * GridSlotsPerPage;
bool gridFull = false;
int startingSlotIndex = index;
List<MagicGridButtonCanvasPlaceholder> unusedPlaceholders = new List<MagicGridButtonCanvasPlaceholder>();
unusedPlaceholders.AddRange(_slotPlaceholders);
while (!gridFull)
{
if (currentLeft + buttonWidth >= (canvasWidth + 50))
{
// new line
currentLeft = 0;
col = 0;
currentTop += buttonHeight;
row += 1;
}
if (currentTop + buttonHeight > canvasHeight)
{
gridFull = true;
break;
}
MagicGridButtonCanvasPlaceholder ph = null;
ph = _slotPlaceholders.FirstOrDefault(sp => sp.MagicGridSlotIndex == index);
if (ph == null)
{
ph = new MagicGridButtonCanvasPlaceholder();
ph.MagicGridSlotIndex = index;
_slotPlaceholders.Add(ph);
_firePageChangeOnNextRecalculate = true;
} else
{
unusedPlaceholders.Remove(ph);
}
ph.IsActive = true;
ph.MagicGridRow = row;
ph.MagicGridColumn = col;
ph.Width = buttonWidth;
ph.Height = buttonHeight;
Canvas.SetTop(ph, currentTop);
Canvas.SetLeft(ph, currentLeft);
currentLeft += buttonWidth;
index += 1;
col += 1;
}
foreach (var p in unusedPlaceholders)
{
p.IsActive = false;
}
foreach (var p in _slotPlaceholders)
{
if (p.IsActive)
{
if (!canvasButtons.Children.Contains(p))
{
canvasButtons.Children.Add(p);
}
} else
{
if (canvasButtons.Children.Contains(p))
{
canvasButtons.Children.Remove(p);
}
}
}
CurrentPageSlotIndexStart = startingSlotIndex;
CurrentPageSlotIndexEnd = index;
if (_firePageChangeOnNextRecalculate)
{
_firePageChangeOnNextRecalculate = false;
if (PageChanged != null)
{
PageChanged(this, CurrentPage);
}
}
}
internal MagicGridButton AddButton(MagicGridButton button, int? gridSlotIndex)
{
if (_slotPlaceholders.Count == 0)
{
RecalculateGrid();
}
DLog("Adding button " + (button.Text ?? "(null title)"));
button.ParentGridControl = this;
button.ButtonSelected += OnChildButtonSelected;
button.ButtonUnselected += OnChildButtonUnselected;
string labelIndex = string.Empty;
MagicGridButtonCanvasPlaceholder targetSlot = null;
int highestIndex = 0;
foreach (var slot in _slotPlaceholders.OrderBy(sp => sp.MagicGridSlotIndex))
{
if (slot.MagicGridSlotIndex > highestIndex)
{
highestIndex = slot.MagicGridSlotIndex;
}
if (slot.Child == null)
{
if (gridSlotIndex == null)
{
gridSlotIndex = slot.MagicGridSlotIndex;
targetSlot = slot;
break;
}
}
if (gridSlotIndex != null)
{
if (slot.MagicGridSlotIndex == gridSlotIndex)
{
targetSlot = slot;
}
}
}
if (targetSlot == null)
{
MagicGridButtonCanvasPlaceholder newPh = new MagicGridButtonCanvasPlaceholder() { MagicGridSlotIndex = highestIndex + 1 };
_slotPlaceholders.Add(newPh);
targetSlot = newPh;
_queueResize = true;
}
targetSlot.Child = button;
button.Width = double.NaN;
button.Height = double.NaN;
labelIndex = (targetSlot.MagicGridSlotIndex + 1).ToString();
if (!ShowButtonIndexes)
{
labelIndex = string.Empty;
}
button.IndexLabelText = labelIndex.ToString();
button.SelectedBackground = SelectedBackground;
button.SelectedForeground = SelectedForeground;
button.UnselectedBackground = UnselectedBackground;
button.UnselectedForeground = UnselectedForeground;
if (button.IsSelected)
{
button.Select(false);
} else
{
button.Unselect(false);
}
//DLog("Button added");
_buttons.Add(button);
//_queueReloadButtons = true;
//ReloadButtonsCanvas();
return button;
}