I am using the Infragistics XamDialogWindow to approximate an MDI window in WPF.
Basically I have a user control that I assign to the content of the window and then add the XamDialogWindow as a child of a Grid.
I then have two buttons which display the windows as either "Tile" or "Cascade".
The cascade works really well but I am having problems with the Tile method.
I get the available width and height using the "ActualWidth" and "ActualHeight" properties of the container.
I then calculate the number of rows and columns needed.
Next I iterate through the columns and I calculate how many rows there are in a column, (this means that if there are an odd number of windows such as 5 I will have two rows in column 0 and 3 in column 1).
The width of each window is worked out as "AvailableWidth / numColumns"
The height of each window is worked out as "AvailableHeight / WindowsForThisColumn"
I then iterate through the rows and calculate the top left coordinate of the window we are positioning as follows:
left = columnIndex * width
top = rowIndex * height
The Left, Top, Width and Height properties of the window are then set.
PROBLEM
The Left, Top, Width and Height properties seem to be calculated correctly so for example
- AvailableWidth = 1000;
- AvailableHeight = 1000;
- Window1 = 0, 0, 500, 500
- Window2 = 0, 500, 500, 500
- Window3 = 500, 0,500, 500
- Window4 = 500, 500, 500, 500
This should give a nice grid of 4 windows with no margins filling all available space, however this is not the result.
The windows seem to be offset when displayed (see image below).
If I look at the Left, Top, Width and Height properties they all appear to be correct.
The weird thing is, if I click "Tile" a second time they will all appear correctly.
If I move a window after clicking tile the second time, they will appear correctly.
I have tried using a Canvas and setting the Canvas.Left and Top properties, A grid, stackpanel and wrappanel with the same results every time.
Can anyone help me? I think it may be a problem with how WPF measures sizes and locations at Render Time
var childrenToArrange = Children.Where(a => a.WindowState != Infragistics.Controls.Interactions.WindowState.Minimized).ToList(); var availableWidth = Panel.ActualWidth; var availableHeight = Panel.ActualHeight; if (Layout == MDILayout.TILE) { //get the number of rows and columns int rows = (int)Math.Sqrt(childrenToArrange.Count); int columns = childrenToArrange.Count / rows; var index = 0; var width = availableWidth / columns; //iterate through the columns for (int x = 0; x < columns; x++) { //get the number of windows for this column var windowsForThisColumn = rows; if (childrenToArrange.Count % columns > (columns - x - 1)) windowsForThisColumn++; var height = availableHeight / windowsForThisColumn; //iterate through the rows for (int y = 0; y < windowsForThisColumn; y++) { //get the X and Y coordinates var left = x * width; var top = y * height; //get the window var mdiChild = childrenToArrange[index] as XamDialogWindow; mdiChild.Margin = new Thickness(0); mdiChild.Left = left; mdiChild.Top = top; mdiChild.Width = width; mdiChild.Height = height; index++; } } } 1 Answers
Answers 1
I've reproduced the issue with your snippet. Please click the following hyperlink to the following forum post at Infragistics for further instructions.
- Michael DiFilippo
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