/// <summary>
/// Control.OnMouseDown override. Handles tree-specific mouse gestures and events.
/// </summary>
/// <param name="e">MouseEventArgs</param>
protected override void OnMouseDown(MouseEventArgs e)
{
if (e.Clicks == 2)
{
var doubleClickArgs = new DoubleClickEventArgs(this, e.Button, e.X, e.Y);
OnDoubleClick(doubleClickArgs);
if (doubleClickArgs.Handled)
{
SetStateFlag(VTCStateFlags.CallDefWndProc, false);
}
}
else
{
var hitInfo = myMouseDownHitInfo = HitInfo(e.X, e.Y);
// == OnItemButton is correct here. Ignore OnItemButton if OnBlankItem is also set
if (e.Button == MouseButtons.Left
&& 0 != (hitInfo.HitTarget & VirtualTreeHitTargets.OnItemButton))
{
if (myTree.IsExpandable(hitInfo.Row, hitInfo.NativeColumn))
{
myTree.ToggleExpansion(hitInfo.Row, hitInfo.NativeColumn);
SetStateFlag(VTCStateFlags.CallDefWndProc, false);
return;
}
}
if (e.Button == MouseButtons.Left
&& 0 != (hitInfo.HitTarget & VirtualTreeHitTargets.OnItemStateIcon))
{
// the state icon was clicked
ToggleAndSynchronizeState(myMouseDownHitInfo.Row, myMouseDownHitInfo.NativeColumn);
SetStateFlag(VTCStateFlags.CallDefWndProc, false);
return;
}
if (0 != (hitInfo.HitTarget & VirtualTreeHitTargets.OnBlankItem)
&& e.Button != MouseButtons.Right)
{
if (hitInfo.HitTarget != VirtualTreeHitTargets.OnBlankItem)
{
// This is an anchored blank item, handle it specially.
// Hold off on shifting anchor columns until we need to.
if (RequireColumnSwitchForSelection(ref hitInfo))
{
SetSelectionColumn(hitInfo.DisplayColumn, false);
}
if (GetStyleFlag(VTCStyleFlags.ExtendedMultiSelect))
{
var isControlPressed = GetStateFlag(VTCStateFlags.MouseButtonDownCtrl);
SetCurrentExtendedMultiSelectIndex(
hitInfo.Row, GetStateFlag(VTCStateFlags.MouseButtonDownShift), isControlPressed,
isControlPressed ? ModifySelectionAction.Toggle : ModifySelectionAction.Select);
}
else
{
CurrentIndex = hitInfo.Row;
}
}
SetStateFlag(VTCStateFlags.CallDefWndProc, false);
SetStateFlag(VTCStateFlags.StandardLButtonDownProcessing, true);
}
// special handling for right-clicks. These don't select in a standard list box, we want
// them to select here
else if (e.Button == MouseButtons.Right)
{
if (myMouseDownHitInfo.Row != -1)
{
DoSelectionChangeFromMouse(
ref hitInfo, GetStateFlag(VTCStateFlags.MouseButtonDownShift), GetStateFlag(VTCStateFlags.MouseButtonDownCtrl),
MouseButtons.Right);
}
}
}
base.OnMouseDown(e);
}
/// <summary>
/// Overriden to run the default action specified by the currently selected branch.
/// </summary>
/// <param name="e"></param>
protected override void OnDoubleClick(DoubleClickEventArgs e)
{
if (e.HitInfo.HitTarget == VirtualTreeHitTargets.OnItemIcon)
{
var branch = e.ItemInfo.Branch as ITreeGridDesignerBranch;
if (branch != null
&& Site != null
&& e.ItemInfo.Row != -1)
{
if (DoDefaultAction(branch, e.ItemInfo.Row))
{
return;
}
}
}
base.OnDoubleClick(e);
}
/// <summary>
/// Called when an item is double-clicked
/// </summary>
/// <param name="e">VirtualTreeControl specific DoubleClickEventArgs</param>
protected virtual void OnDoubleClick(DoubleClickEventArgs e)
{
var handler = Events[EVENT_DOUBLECLICK] as DoubleClickEventHandler;
if (handler != null)
{
handler(this, e);
}
if (!e.Handled
&& myTree != null
&& e.Button == MouseButtons.Left)
{
var hitInfo = e.HitInfo;
if (0 != (hitInfo.HitTarget & VirtualTreeHitTargets.OnItem))
{
var itemInfo = e.ItemInfo;
if (0 != (hitInfo.HitTarget & VirtualTreeHitTargets.OnItemStateIcon))
{
// Treat a double click as two single clicks if applied directly to
// the state icon.
ToggleAndSynchronizeState(hitInfo.Row, hitInfo.NativeColumn);
}
else if (itemInfo.Expandable)
{
myTree.ToggleExpansion(hitInfo.Row, hitInfo.NativeColumn);
}
else if (myStateImageList != null)
{
// Just toggle here, don't synchronize. This behavior is consisten
// with the standard ListView control. The synchronization is hard
// for the user and code to coordinate because the single click just
// toggled the selection state.
myTree.ToggleState(hitInfo.Row, hitInfo.NativeColumn);
}
}
else if (0 != (hitInfo.HitTarget & VirtualTreeHitTargets.OnItemButton))
{
// avoid calling the DefWndProc if the click was on the button, because this
// causes scrolling to the selected index, which may not be the one double-clicked on.
SetStateFlag(VTCStateFlags.CallDefWndProc, false);
}
}
}