/// <summary>
/// Show the context menu relative to the provided screen rectangle.
/// </summary>
/// <param name="caller">Reference to object causing the context menu to be shown.</param>
/// <param name="screenRect">Screen rectangle.</param>
/// <param name="horz">Horizontal location relative to screen rectangle.</param>
/// <param name="vert">Vertical location relative to screen rectangle.</param>
/// <param name="keyboardActivated">Was context menu initiated via a keyboard action.</param>
/// <param name="constrain">Should size and position of menu be constrained by display size.</param>
/// <returns>Has the context menu become displayed.</returns>
public bool Show(object caller,
Rectangle screenRect,
KryptonContextMenuPositionH horz,
KryptonContextMenuPositionV vert,
bool keyboardActivated,
bool constrain)
{
bool displayed = false;
// Only need to show if not already displaying it
if (_contextMenu == null)
{
// Remember the caller for us in events
_caller = caller;
// Give event handler a change to cancel the open request
CancelEventArgs cea = new CancelEventArgs();
OnOpening(cea);
if (!cea.Cancel)
{
// Set a default reason for the menu being dismissed
_closeReason = ToolStripDropDownCloseReason.AppFocusChange;
// Create the actual control used to show the context menu
_contextMenu = CreateContextMenu(this, _localPalette, _paletteMode,
_redirector, _redirectorImages,
Items, Enabled, keyboardActivated);
// Need to know when the visual control is removed
_contextMenu.Disposed += new EventHandler(OnContextMenuDisposed);
// Request the menu be shown immediately
_contextMenu.Show(screenRect, horz, vert, false, constrain);
// Override the horz, vert setting so that sub menus appear right and below
_contextMenu.ShowHorz = KryptonContextMenuPositionH.After;
_contextMenu.ShowVert = KryptonContextMenuPositionV.Top;
// Indicate the context menu is fully constructed and displayed
OnOpened(EventArgs.Empty);
// The menu has actually become displayed
displayed = true;
}
}
return(displayed);
}
private void OnContextMenuDisposed(object sender, EventArgs e)
{
// Should still be caching a reference to actual display control
if (_contextMenu != null)
{
// Unhook from control, so it can be garbage collected
_contextMenu.Disposed -= new EventHandler(OnContextMenuDisposed);
// No longer need to cache reference
_contextMenu = null;
// Tell our view manager that we no longer show a sub menu
_provider.ProviderViewManager.ClearTargetSubMenu((IContextMenuTarget)KeyController);
}
}
private void OnContextMenuDisposed(object sender, EventArgs e)
{
// Should still be caching a reference to actual display control
if (_contextMenu != null)
{
// Unhook from control, so it can be garbage collected
_contextMenu.Disposed -= new EventHandler(OnContextMenuDisposed);
// Copy to ourself the close reason
if (_contextMenu.CloseReason.HasValue)
{
CloseReason = _contextMenu.CloseReason.Value;
}
// No longer need to cache reference
_contextMenu = null;
// Notify event handlers the context menu has been closed and why it closed
OnClosed(new ToolStripDropDownClosedEventArgs(CloseReason));
}
}
/// <summary>
/// Ask the menu item to show the associated child collection as a menu.
/// </summary>
public void ShowSubMenu(bool keyboardActivated)
{
// Only need to show if not already doing so
if ((_contextMenu == null) || (_contextMenu.IsDisposed))
{
// No need for the sub menu timer anymore, we are showing
_provider.ProviderViewManager.SetTargetSubMenu((IContextMenuTarget)KeyController);
// Only show a sub menu if there is one to be shown!
if (HasSubMenu)
{
// Create the actual control used to show the context menu
_contextMenu = new VisualContextMenu(_provider, _menuItem.Items, keyboardActivated);
// Need to know when the visual control is removed
_contextMenu.Disposed += new EventHandler(OnContextMenuDisposed);
// Get the screen rectangle for the drawing element
Rectangle menuDrawRect = this.OwningControl.RectangleToScreen(ClientRectangle);
// Should this menu item be shown at a fixed screen rectangle?
if (_provider.ProviderShowSubMenuFixed(_menuItem))
{
// Request the menu be shown at fixed screen rectangle
_contextMenu.ShowFixed(_provider.ProviderShowSubMenuFixedRect(_menuItem),
_provider.ProviderShowHorz,
_provider.ProviderShowVert);
}
else
{
// Request the menu be shown immediately
_contextMenu.Show(menuDrawRect,
_provider.ProviderShowHorz,
_provider.ProviderShowVert,
true, false);
}
}
}
}
/// <summary>
/// Get the renderer.
/// </summary>
/// <returns>Render instance.</returns>
public IRenderer GetRenderer()
{
VisualContextMenu contextMenu = (VisualContextMenu)_provider.ProviderViewManager.Control;
return(contextMenu.Renderer);
}