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//
// ContextMenuTreeView.cs
//
// Author:
// Michael Hutchinson <mhutch@xamarin.com>
//
// Copyright (c) 2011 Xamarin Inc. (http://xamarin.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using Mono.TextEditor;
namespace MonoDevelop.Components
{
/// <summary>
/// TreeView with context menu support.
/// </summary>
public class ContextMenuTreeView : Gtk.TreeView
{
public ContextMenuTreeView ()
{
}
public ContextMenuTreeView (Gtk.TreeModel model) : base (model)
{
}
public Action<Gdk.EventButton> DoPopupMenu { get; set; }
Gtk.TreePath buttonPressPath;
bool selectOnRelease;
protected override void OnDragBegin (Gdk.DragContext context)
{
//If user starts dragging don't do any selection
//useful in case user press Esc to abort dragging and
//didn't release mouse button yet
selectOnRelease = false;
base.OnDragBegin (context);
}
protected override bool OnButtonPressEvent (Gdk.EventButton evnt)
{
selectOnRelease = false;
if (!evnt.TriggersContextMenu ()) {
//Because we are blocking selection changes with SelectFunction base.OnButtonPressEvent
//can be called so expanders work. Another good effect is when expander is clicked
//SelectFunction is not called so selectOnRelease remains false.
//Which means no selection operation is performed in OnButtonReleaseEvent.
//When Shift is pressed we don't do our magic becasue:
//a) it works as expected((item is still selected when dragging starts
//(it's by nature of Shift selecting))
//b) we would have to simulate Shift selecting in OnButtonReleaseEvent
//which would mean we have to implement all selecting logic...
//Also notice that our magic is requiered only when item is selected.
if (GetPathAtPos ((int)evnt.X, (int)evnt.Y, out buttonPressPath) &&
((evnt.State & Gdk.ModifierType.ShiftMask) == 0) &&
Selection.PathIsSelected (buttonPressPath)) {
this.Selection.SelectFunction = (s, m, p, b) => {
selectOnRelease = true;
//Always returning false means we are blocking base.OnButtonPressEvent
//from doing any changes to selectiong we will do changes in OnButtonReleaseEvent
return false;
};
}
return base.OnButtonPressEvent (evnt);
}
//pass click to base it it can update the selection
//unless the node is already selected, in which case we don't want to change the selection
bool res = false;
if (!IsClickedNodeSelected ((int)evnt.X, (int)evnt.Y)) {
res = base.OnButtonPressEvent (evnt);
}
if (DoPopupMenu != null) {
DoPopupMenu (evnt);
return true;
}
return res;
}
protected override bool OnButtonReleaseEvent (Gdk.EventButton evnt)
{
this.Selection.SelectFunction = (s, m, p, b) => {
return true;
};
Gtk.TreePath buttonReleasePath;
//If OnButtonPressEvent attempted on making deselection and dragging was not started
//check if we are on same item as when we clicked(could be different if dragging is disabled)
if (selectOnRelease &&
GetPathAtPos ((int)evnt.X, (int)evnt.Y, out buttonReleasePath) &&
buttonPressPath.Compare (buttonReleasePath) == 0) {
//Simulate what would happen in OnButtonPressEvent if we were not blocking selection
//notice that item is currently 100% selected since this check was performed in OnButtonPressEvent
if (Selection.Mode == Gtk.SelectionMode.Multiple &&
(evnt.State & Gdk.ModifierType.ControlMask) > 0) {
Selection.UnselectPath (buttonReleasePath);
} else {
//UnselectAll in case multiple were selected we want only our item to be selected now
//if it was clicked but not dragged
Selection.UnselectAll ();
Selection.SelectPath (buttonReleasePath);
}
buttonPressPath = null;
}
selectOnRelease = false;
bool res = base.OnButtonReleaseEvent (evnt);
if (DoPopupMenu != null && evnt.IsContextMenuButton ()) {
return true;
}
return res;
}
protected override bool OnPopupMenu ()
{
if (DoPopupMenu != null) {
DoPopupMenu (null);
return true;
}
return base.OnPopupMenu ();
}
bool IsClickedNodeSelected (int x, int y)
{
Gtk.TreePath path;
if (GetPathAtPos (x, y, out path))
return Selection.PathIsSelected (path);
return false;
}
bool MultipleNodesSelected ()
{
return Selection.GetSelectedRows ().Length > 1;
}
}
}
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