internal static DisplayRegionHelperInfo GetRegionInfo(IntPtr hwnd)
{
DisplayRegionHelperInfo info = new DisplayRegionHelperInfo(TwoPaneViewMode.SinglePane);
if (hwnd != IntPtr.Zero && s_isGetContentRectsSupported)
{
List <Rect> rects = GetRegions(hwnd);
if (rects != null && rects.Count == 2)
{
info.Regions[0] = rects[0];
info.Regions[1] = rects[1];
// Determine orientation. If neither of these are true, default to doing nothing.
if (info.Regions[0].X < info.Regions[1].X && info.Regions[0].Y == info.Regions[1].Y)
{
// Double portrait
info.Mode = TwoPaneViewMode.Wide;
}
else if (info.Regions[0].X == info.Regions[1].X && info.Regions[0].Y < info.Regions[1].Y)
{
// Double landscape
info.Mode = TwoPaneViewMode.Tall;
}
}
}
return(info);
}
private bool IsInMultipleRegions(DisplayRegionHelperInfo info, Rect rcControl)
{
bool isInMultipleRegions = false;
if (info.Mode != TwoPaneViewMode.SinglePane)
{
Rect rc1 = info.Regions[0];
Rect rc2 = info.Regions[1];
Rect rcWindow = DisplayRegionHelper.WindowRect(hwndSource?.Handle ?? IntPtr.Zero);
if (info.Mode == TwoPaneViewMode.Wide)
{
// Check that the control is over the split
if (rcControl.X < rc1.Width && rcControl.X + rcControl.Width > rc2.X)
{
isInMultipleRegions = true;
}
}
else if (info.Mode == TwoPaneViewMode.Tall)
{
// Check that the control is over the split
if (rcControl.Y < rc1.Height && rcControl.Y + rcControl.Height > rc2.Y)
{
isInMultipleRegions = true;
}
}
}
return(isInMultipleRegions);
}
private void UpdateRowsColumns(ViewMode newMode, DisplayRegionHelperInfo info, Rect rcControl)
{
if (m_columnLeft != null && m_columnMiddle != null && m_columnRight != null && m_rowTop != null && m_rowMiddle != null && m_rowBottom != null)
{
// Reset split lengths
m_columnMiddle.Width = new GridLength(0, GridUnitType.Pixel);
m_rowMiddle.Height = new GridLength(0, GridUnitType.Pixel);
// Set columns lengths
if (newMode == ViewMode.LeftRight || newMode == ViewMode.RightLeft)
{
m_columnLeft.Width = (newMode == ViewMode.LeftRight) ? Pane1Length : Pane2Length;
m_columnRight.Width = (newMode == ViewMode.LeftRight) ? Pane2Length : Pane1Length;
}
else
{
m_columnLeft.Width = new GridLength(1, GridUnitType.Star);
m_columnRight.Width = new GridLength(0, GridUnitType.Pixel);
}
// Set row lengths
if (newMode == ViewMode.TopBottom || newMode == ViewMode.BottomTop)
{
m_rowTop.Height = (newMode == ViewMode.TopBottom) ? Pane1Length : Pane2Length;
m_rowBottom.Height = (newMode == ViewMode.TopBottom) ? Pane2Length : Pane1Length;
}
else
{
m_rowTop.Height = new GridLength(1, GridUnitType.Star);
m_rowBottom.Height = new GridLength(0, GridUnitType.Pixel);
}
// Handle regions
if (IsInMultipleRegions(info, rcControl) && newMode != ViewMode.Pane1Only && newMode != ViewMode.Pane2Only)
{
Rect rc1 = info.Regions[0];
Rect rc2 = info.Regions[1];
Rect rcWindow = DisplayRegionHelper.WindowRect(hwndSource?.Handle ?? IntPtr.Zero);
if (info.Mode == TwoPaneViewMode.Wide)
{
m_columnMiddle.Width = new GridLength(rc2.X - rc1.Width, GridUnitType.Pixel);
m_columnLeft.Width = new GridLength(rc1.Width - rcControl.X, GridUnitType.Pixel);
m_columnRight.Width = new GridLength(rc2.Width - ((rcWindow.Width - rcControl.Width) - rcControl.X), GridUnitType.Pixel);
}
else
{
m_rowMiddle.Height = new GridLength(rc2.Y - rc1.Height, GridUnitType.Pixel);
m_rowTop.Height = new GridLength(rc1.Height - rcControl.Y, GridUnitType.Pixel);
m_rowBottom.Height = new GridLength(rc2.Height - ((rcWindow.Height - rcControl.Height) - rcControl.Y), GridUnitType.Pixel);
}
}
}
}
private void UpdateMode()
{
// Don't bother running this logic until after we hit OnApplyTemplate.
if (!m_loaded)
{
return;
}
double controlWidth = ActualWidth;
double controlHeight = ActualHeight;
ViewMode newMode = (PanePriority == TwoPaneViewPriority.Pane1) ? ViewMode.Pane1Only : ViewMode.Pane2Only;
// Calculate new mode
DisplayRegionHelperInfo info = DisplayRegionHelper.GetRegionInfo(hwndSource?.Handle ?? IntPtr.Zero);
Rect rcControl = GetControlRect();
bool isInMultipleRegions = IsInMultipleRegions(info, rcControl);
if (isInMultipleRegions)
{
if (info.Mode == TwoPaneViewMode.Wide)
{
// Regions are laid out horizontally
if (WideModeConfiguration != TwoPaneViewWideModeConfiguration.SinglePane)
{
newMode = WideModeConfiguration == TwoPaneViewWideModeConfiguration.LeftRight ? ViewMode.LeftRight : ViewMode.RightLeft;
}
}
else if (info.Mode == TwoPaneViewMode.Tall)
{
// Regions are laid out vertically
if (TallModeConfiguration != TwoPaneViewTallModeConfiguration.SinglePane)
{
newMode = (TallModeConfiguration == TwoPaneViewTallModeConfiguration.TopBottom) ? ViewMode.TopBottom : ViewMode.BottomTop;
}
}
}
else
{
// One region
if (controlWidth > MinWideModeWidth && WideModeConfiguration != TwoPaneViewWideModeConfiguration.SinglePane)
{
// Split horizontally
newMode = (WideModeConfiguration == TwoPaneViewWideModeConfiguration.LeftRight) ? ViewMode.LeftRight : ViewMode.RightLeft;
}
else if (controlHeight > MinTallModeHeight && TallModeConfiguration != TwoPaneViewTallModeConfiguration.SinglePane)
{
// Split vertically
newMode = (TallModeConfiguration == TwoPaneViewTallModeConfiguration.TopBottom) ? ViewMode.TopBottom : ViewMode.BottomTop;
}
}
// Update row/column sizes (this may need to happen even if the mode doesn't change)
UpdateRowsColumns(newMode, info, rcControl);
// Update mode if necessary
if (newMode != m_currentMode)
{
m_currentMode = newMode;
TwoPaneViewMode newViewMode = TwoPaneViewMode.SinglePane;
switch (m_currentMode)
{
case ViewMode.Pane1Only: VisualStateManager.GoToState(this, "ViewMode_OneOnly", true); break;
case ViewMode.Pane2Only: VisualStateManager.GoToState(this, "ViewMode_TwoOnly", true); break;
case ViewMode.LeftRight: VisualStateManager.GoToState(this, "ViewMode_LeftRight", true); newViewMode = TwoPaneViewMode.Wide; break;
case ViewMode.RightLeft: VisualStateManager.GoToState(this, "ViewMode_RightLeft", true); newViewMode = TwoPaneViewMode.Wide; break;
case ViewMode.TopBottom: VisualStateManager.GoToState(this, "ViewMode_TopBottom", true); newViewMode = TwoPaneViewMode.Tall; break;
case ViewMode.BottomTop: VisualStateManager.GoToState(this, "ViewMode_BottomTop", true); newViewMode = TwoPaneViewMode.Tall; break;
}
if (newViewMode != Mode)
{
SetValue(ModeKey, newViewMode);
ModeChanged?.Invoke(this, EventArgs.Empty);
}
}
}