/// <summary>
/// Handles selection and caret changes due to mouse clicks.
/// </summary>
private void DoSelectionChangeFromMouse(
ref VirtualTreeHitInfo hitInfo, bool shiftPressed, bool controlPressed, MouseButtons mouseButton)
{
var fireEvent = false;
var columnSwitch = RequireColumnSwitchForSelection(ref hitInfo);
if (columnSwitch)
{
SetSelectionColumn(myMouseDownHitInfo.DisplayColumn, false);
fireEvent = true;
}
if (hitInfo.Row != VirtualTreeConstant.NullIndex)
{
if (mouseButton == MouseButtons.Right &&
IsSelected(hitInfo.Row))
{
// if right button is clicked, and the index is already selected,
// we'll just change the caret.
if (CaretIndex != hitInfo.Row)
{
CaretIndex = hitInfo.Row;
}
}
else
{
if (GetStyleFlag(VTCStyleFlags.ExtendedMultiSelect))
{
var action = controlPressed ? ModifySelectionAction.Toggle : ModifySelectionAction.Select;
SetCurrentExtendedMultiSelectIndex(hitInfo.Row, shiftPressed, controlPressed, action);
// SetCurrentExtendedMultiSelectIndex fires SelectionChanged event.
fireEvent = false;
}
else if (GetStyleFlag(VTCStyleFlags.MultiSelect))
{
SetSelected(hitInfo.Row, !IsSelected(hitInfo.Row) || columnSwitch);
CurrentIndex = hitInfo.Row; // CurrentIndex setter fires SelectionChanged event.
fireEvent = false;
}
else if (!IsSelected(hitInfo.Row))
{
CurrentIndex = hitInfo.Row; // CurrentIndex setter fires SelectionChanged event.
fireEvent = false;
}
}
}
if (fireEvent)
{
DoSelectionChanged();
}
}
internal VirtualTreeExtendedHitInfo(ref VirtualTreeHitInfo hitInfo, ref ExtraHitInfo extraHitInfo)
{
myHitInfo = hitInfo;
myExtraHitInfo = extraHitInfo;
}
public static bool Compare(VirtualTreeHitInfo operand1, VirtualTreeHitInfo operand2)
{
Debug.Assert(false); // There is no need to compare these
return(false);
}
public void Activate(ref VirtualTreeHitInfo hit, ref ExtraHitInfo extraInfo, ref Point mousePos, bool immediateActivation)
{
var hWnd = Handle.ToInt32();
if (hWnd == 0)
{
return;
}
var ctrlhWnd = Handle;
NativeMethods.SendMessage(ctrlhWnd, NativeMethods.TTM_ACTIVATE, 0, hWnd);
if (hit.Row != VirtualTreeConstant.NullIndex)
{
var ti = new NativeMethods.TOOLINFO();
ti.SetSize();
ti.uId = hWnd;
ti.uFlags = NativeMethods.TTF_IDISHWND;
ti.rect = NativeMethods.RECT.FromXYWH(
extraInfo.ClippedItemRectangle.X,
extraInfo.ClippedItemRectangle.Y,
extraInfo.ClippedItemRectangle.Width,
extraInfo.ClippedItemRectangle.Height);
NativeMethods.SendMessage(
ctrlhWnd, NativeMethods.TTM_SETDELAYTIME, NativeMethods.TTDT_INITIAL, immediateActivation ? 0 : 250);
NativeMethods.SendMessage(ctrlhWnd, NativeMethods.TTM_NEWTOOLRECT, 0, ref ti);
NativeMethods.SendMessage(ctrlhWnd, NativeMethods.TTM_ACTIVATE, 1, hWnd);
Font = extraInfo.LabelFont;
myFormat = extraInfo.LabelFormat;
myFullLabelRectangle = extraInfo.FullLabelRectangle;
myActivatingMousePos = mousePos;
}
}
/// <summary>
/// Helper routine to determine if the column needs to be switched to
/// correctly display the selection of an item.
/// </summary>
/// <param name="hitInfo">The hitInfo to test</param>
/// <returns>true if a column change is required to honor the selection request</returns>
private bool RequireColumnSwitchForSelection(ref VirtualTreeHitInfo hitInfo)
{
var retVal = false;
var selColumn = mySelectionColumn;
if (hitInfo.DisplayColumn != selColumn)
{
if (GetStyleFlag(VTCStyleFlags.MultiSelect) && ExtendSelectionToAnchors)
{
if (hitInfo.DisplayColumn == hitInfo.RawColumn)
{
// Single width column, must switch
retVal = true;
}
else if (!((selColumn >= hitInfo.DisplayColumn && selColumn <= hitInfo.RawColumn) ||
(selColumn <= hitInfo.DisplayColumn && selColumn >= hitInfo.RawColumn)))
{
// The selection column is between the hit columns
// Note that the only time this does not work is with a blank expansion
// that has an offset anchor. However, even in this case, you have to click
// on the column, or on opposite sides of the column to make the column switch,
// which is still a reasonable behavior.
retVal = true;
}
}
else
{
retVal = true;
}
}
return retVal;
}
/// <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);
}
internal VirtualTreeExtendedHitInfo(ref VirtualTreeHitInfo hitInfo, ref ExtraHitInfo extraHitInfo)
{
myHitInfo = hitInfo;
myExtraHitInfo = extraHitInfo;
}
public static bool Compare(VirtualTreeHitInfo operand1, VirtualTreeHitInfo operand2)
{
Debug.Assert(false); // There is no need to compare these
return false;
}