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|
// 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.
//
// Copyright (c) 2004-2005 Novell, Inc.
//
// Authors:
// Jordi Mas i Hernandez, jordi@ximian.com
// Mike Kestner <mkestner@novell.com>
//
// NOT COMPLETE
using System.Collections;
using System.Drawing;
namespace System.Windows.Forms {
/*
When writing this code the Wine project was of great help to
understand the logic behind some Win32 issues. Thanks to them. Jordi,
*/
internal class MenuTracker {
bool active;
public Menu CurrentMenu;
public Menu TopMenu;
GrabControl grab_control;
class GrabControl : Control {
MenuTracker tracker;
public GrabControl (MenuTracker owner) : base ()
{
tracker = owner;
}
protected override void OnMouseDown (MouseEventArgs args)
{
tracker.OnClick (new MouseEventArgs (args.Button, args.Clicks, Control.MousePosition.X, Control.MousePosition.Y, args.Delta));
}
protected override void OnMouseMove (MouseEventArgs args)
{
tracker.OnMotion (new MouseEventArgs (args.Button, args.Clicks, Control.MousePosition.X, Control.MousePosition.Y, args.Delta));
}
}
public MenuTracker (Menu top_menu)
{
TopMenu = CurrentMenu = top_menu;
foreach (MenuItem item in TopMenu.MenuItems)
AddShortcuts (item);
grab_control = new GrabControl (this);
if (top_menu is ContextMenu) {
(top_menu as ContextMenu).SourceControl.FindForm ().Controls.AddImplicit (grab_control);
active = true;
grab_control.Capture = true;
} else
top_menu.Wnd.FindForm ().Controls.AddImplicit (grab_control);
}
enum KeyNavState {
Idle,
Startup,
NoPopups,
Navigating
}
KeyNavState keynav_state = KeyNavState.Idle;
public bool Navigating {
get { return keynav_state != KeyNavState.Idle; }
}
public void Dispose ()
{
grab_control.Parent.Controls.RemoveImplicit (grab_control);
}
Point ScreenToMenu (Menu menu, Point pnt)
{
int x = pnt.X;
int y = pnt.Y;
XplatUI.ScreenToMenu (menu.Wnd.window.Handle, ref x, ref y);
return new Point (x, y);
}
void Deactivate ()
{
active = false;
grab_control.Capture = false;
keynav_state = KeyNavState.Idle;
if (TopMenu is ContextMenu) {
PopUpWindow puw = TopMenu.Wnd as PopUpWindow;
puw.HideWindow ();
} else {
DeselectItem (TopMenu.SelectedItem);
(TopMenu as MainMenu).Draw ();
}
CurrentMenu = TopMenu;
}
MenuItem FindItemByCoords (Menu menu, Point pt)
{
if (menu is MainMenu)
pt = ScreenToMenu (menu, pt);
else
pt = menu.Wnd.PointToClient (pt);
foreach (MenuItem item in menu.MenuItems) {
Rectangle rect = item.bounds;
if (rect.Contains (pt))
return item;
}
return null;
}
MenuItem GetItemAtXY (int x, int y)
{
Point pnt = new Point (x, y);
MenuItem item = FindItemByCoords (TopMenu, pnt);
if (item == null && TopMenu.SelectedItem != null)
item = FindSubItemByCoord (TopMenu.SelectedItem, Control.MousePosition);
return item;
}
public void OnClick (MouseEventArgs args)
{
MenuItem item = GetItemAtXY (args.X, args.Y);
if (item == null) {
Deactivate ();
return;
}
SelectItem (item.Parent, item, item.IsPopup);
if (item.IsPopup) {
active = true;
grab_control.Capture = true;
} else if (item.Parent is MainMenu)
active = false;
else
Deactivate ();
item.PerformClick ();
}
public void OnMotion (MouseEventArgs args)
{
MenuItem item = GetItemAtXY (args.X, args.Y);
if (CurrentMenu.SelectedItem == item)
return;
grab_control.Capture = active || item != null;
Rectangle top_bounds = new Rectangle(0, 0, TopMenu.Rect.Width, TopMenu.Rect.Height);
if (item == null && (!active || top_bounds.Contains (ScreenToMenu (TopMenu, new Point (args.X, args.Y)))))
DeselectItem (TopMenu.SelectedItem);
else
MoveSelection (item);
}
void MoveSelection (MenuItem item)
{
if (item == null) {
if (CurrentMenu.SelectedItem.IsPopup)
return;
MenuItem old_item = CurrentMenu.SelectedItem;
if (CurrentMenu != TopMenu)
CurrentMenu = CurrentMenu.parent_menu;
DeselectItem (old_item);
} else {
if (item.Parent != CurrentMenu.SelectedItem)
DeselectItem (CurrentMenu.SelectedItem);
CurrentMenu = item.Parent;
SelectItem (CurrentMenu, item, active && item.IsPopup);
}
}
static public bool TrackPopupMenu (Menu menu, Point pnt)
{
if (menu.MenuItems.Count <= 0) // No submenus to track
return true;
menu.Wnd = new PopUpWindow (menu);
MenuTracker tracker = new MenuTracker (menu);
menu.Wnd.Location = menu.Wnd.PointToClient (pnt);
((PopUpWindow)menu.Wnd).ShowWindow ();
bool no_quit = true;
while ((menu.Wnd != null) && menu.Wnd.Visible && no_quit) {
MSG msg = new MSG ();
no_quit = XplatUI.GetMessage(ref msg, IntPtr.Zero, 0, 0);
XplatUI.TranslateMessage(ref msg);
XplatUI.DispatchMessage(ref msg);
}
if (!no_quit)
XplatUI.PostQuitMessage(0);
tracker.Dispose ();
if (menu.Wnd != null) {
menu.Wnd.Dispose ();
menu.Wnd = null;
}
return true;
}
void DeselectItem (MenuItem item)
{
if (item == null)
return;
item.Status = item.Status &~ DrawItemState.Selected;
if (item.IsPopup)
HideSubPopups (item);
Menu menu = item.Parent;
if (menu is MainMenu)
(menu as MainMenu).Draw ();
else if (menu.Wnd != null)
menu.Wnd.Invalidate (item.bounds);
}
void SelectItem (Menu menu, MenuItem item, bool execute)
{
MenuItem prev_item = menu.SelectedItem;
if (prev_item != item) {
DeselectItem (prev_item);
if (CurrentMenu != menu)
CurrentMenu = menu;
item.Status |= DrawItemState.Selected;
if (menu is MainMenu)
(menu as MainMenu).Draw ();
else
menu.Wnd.Invalidate (item.bounds);
item.PerformSelect ();
}
if (execute)
ExecFocusedItem (menu, item);
}
// Used when the user executes the action of an item (press enter, shortcut)
// or a sub-popup menu has to be shown
void ExecFocusedItem (Menu menu, MenuItem item)
{
if (!item.Enabled)
return;
if (item.IsPopup) {
ShowSubPopup (menu, item);
} else {
Deactivate ();
item.PerformClick ();
}
}
// Create a popup window and show it or only show it if it is already created
void ShowSubPopup (Menu menu, MenuItem item)
{
if (item.Enabled == false)
return;
if (item.Wnd != null)
item.Wnd.Dispose ();
PopUpWindow puw = new PopUpWindow (item);
Point pnt;
if (menu is MainMenu)
pnt = new Point (item.X, item.Y + 1);
else
pnt = new Point (item.X + item.Width, item.Y + 1);
pnt = menu.Wnd.PointToScreen (pnt);
puw.Location = pnt;
item.Wnd = puw;
puw.ShowWindow ();
}
static public void HideSubPopups (Menu menu)
{
foreach (MenuItem item in menu.MenuItems)
if (item.IsPopup)
HideSubPopups (item);
if (menu.Wnd == null)
return;
PopUpWindow puw = menu.Wnd as PopUpWindow;
puw.Hide ();
}
MenuItem FindSubItemByCoord (Menu menu, Point pnt)
{
foreach (MenuItem item in menu.MenuItems) {
if (item.IsPopup && item.Wnd != null && item.Wnd.Visible && item == menu.SelectedItem) {
MenuItem result = FindSubItemByCoord (item, pnt);
if (result != null)
return result;
}
if (menu.Wnd == null)
continue;
Rectangle rect = item.bounds;
Point pnt_client = menu.Wnd.PointToScreen (new Point (item.X, item.Y));
rect.X = pnt_client.X;
rect.Y = pnt_client.Y;
if (rect.Contains (pnt) == true)
return item;
}
return null;
}
static MenuItem FindItemByKey (Menu menu, IntPtr key)
{
char key_char = (char ) (key.ToInt32() & 0xff);
key_char = Char.ToUpper (key_char);
foreach (MenuItem item in menu.MenuItems) {
if (item.Mnemonic == '\0')
continue;
if (item.Mnemonic == key_char)
return item;
}
return null;
}
enum ItemNavigation {
First,
Last,
Next,
Previous,
}
static MenuItem GetNextItem (Menu menu, ItemNavigation navigation)
{
int pos = 0;
bool selectable_items = false;
MenuItem item;
// Check if there is at least a selectable item
for (int i = 0; i < menu.MenuItems.Count; i++) {
item = menu.MenuItems [i];
if (item.Separator == false && item.Visible == true) {
selectable_items = true;
break;
}
}
if (selectable_items == false)
return null;
switch (navigation) {
case ItemNavigation.First:
/* First item that is not separator and it is visible*/
for (pos = 0; pos < menu.MenuItems.Count; pos++) {
item = menu.MenuItems [pos];
if (item.Separator == false && item.Visible == true)
break;
}
break;
case ItemNavigation.Last: // Not used
break;
case ItemNavigation.Next:
if (menu.SelectedItem != null)
pos = menu.SelectedItem.Index;
/* Next item that is not separator and it is visible*/
for (pos++; pos < menu.MenuItems.Count; pos++) {
item = menu.MenuItems [pos];
if (item.Separator == false && item.Visible == true)
break;
}
if (pos >= menu.MenuItems.Count) { /* Jump at the start of the menu */
pos = 0;
/* Next item that is not separator and it is visible*/
for (; pos < menu.MenuItems.Count; pos++) {
item = menu.MenuItems [pos];
if (item.Separator == false && item.Visible == true)
break;
}
}
break;
case ItemNavigation.Previous:
if (menu.SelectedItem != null)
pos = menu.SelectedItem.Index;
/* Previous item that is not separator and it is visible*/
for (pos--; pos >= 0; pos--) {
item = menu.MenuItems [pos];
if (item.Separator == false && item.Visible == true)
break;
}
if (pos < 0 ) { /* Jump at the end of the menu*/
pos = menu.MenuItems.Count - 1;
/* Previous item that is not separator and it is visible*/
for (; pos >= 0; pos--) {
item = menu.MenuItems [pos];
if (item.Separator == false && item.Visible == true)
break;
}
}
break;
default:
break;
}
return menu.MenuItems [pos];
}
void ProcessMenuKey (Msg msg_type)
{
if (TopMenu.MenuItems.Count == 0)
return;
MainMenu main_menu = TopMenu as MainMenu;
switch (msg_type) {
case Msg.WM_SYSKEYDOWN:
switch (keynav_state) {
case KeyNavState.Idle:
keynav_state = KeyNavState.Startup;
CurrentMenu = TopMenu;
main_menu.Draw ();
break;
case KeyNavState.Startup:
break;
default:
keynav_state = KeyNavState.Idle;
Deactivate ();
main_menu.Draw ();
break;
}
break;
case Msg.WM_SYSKEYUP:
switch (keynav_state) {
case KeyNavState.Idle:
case KeyNavState.Navigating:
break;
case KeyNavState.Startup:
keynav_state = KeyNavState.NoPopups;
SelectItem (TopMenu, TopMenu.MenuItems [0], false);
break;
default:
keynav_state = KeyNavState.Idle;
Deactivate ();
main_menu.Draw ();
break;
}
break;
default:
throw new ArgumentException ("Invalid msg_type " + msg_type);
}
}
bool ProcessMnemonic (Message msg, Keys key_data)
{
keynav_state = KeyNavState.Navigating;
MenuItem item = FindItemByKey (CurrentMenu, msg.WParam);
if (item == null)
return false;
SelectItem (CurrentMenu, item, true);
if (item.IsPopup) {
SelectItem (item, item.MenuItems [0], false);
CurrentMenu = item;
}
return true;
}
void ProcessArrowKey (Keys keyData)
{
MenuItem item;
switch (keyData) {
case Keys.Up:
if (CurrentMenu is MainMenu)
return;
else if (CurrentMenu.MenuItems.Count == 1 && CurrentMenu.parent_menu == TopMenu) {
DeselectItem (CurrentMenu.SelectedItem);
CurrentMenu = TopMenu;
return;
}
item = GetNextItem (CurrentMenu, ItemNavigation.Previous);
if (item != null)
SelectItem (CurrentMenu, item, false);
break;
case Keys.Down:
if (CurrentMenu is MainMenu) {
if (CurrentMenu.SelectedItem != null && CurrentMenu.SelectedItem.IsPopup) {
keynav_state = KeyNavState.Navigating;
item = CurrentMenu.SelectedItem;
ShowSubPopup (CurrentMenu, item);
SelectItem (item, item.MenuItems [0], false);
CurrentMenu = item;
}
return;
}
item = GetNextItem (CurrentMenu, ItemNavigation.Next);
if (item != null)
SelectItem (CurrentMenu, item, false);
break;
case Keys.Right:
if (CurrentMenu is MainMenu) {
item = GetNextItem (CurrentMenu, ItemNavigation.Next);
bool popup = item.IsPopup && keynav_state != KeyNavState.NoPopups;
SelectItem (CurrentMenu, item, popup);
if (popup) {
SelectItem (item, item.MenuItems [0], false);
CurrentMenu = item;
}
} else if (CurrentMenu.SelectedItem.IsPopup) {
item = CurrentMenu.SelectedItem;
ShowSubPopup (CurrentMenu, item);
SelectItem (item, item.MenuItems [0], false);
CurrentMenu = item;
} else if (CurrentMenu.parent_menu is MainMenu) {
item = GetNextItem (CurrentMenu.parent_menu, ItemNavigation.Next);
SelectItem (CurrentMenu.parent_menu, item, item.IsPopup);
if (item.IsPopup) {
SelectItem (item, item.MenuItems [0], false);
CurrentMenu = item;
}
}
break;
case Keys.Left:
if (CurrentMenu is MainMenu) {
item = GetNextItem (CurrentMenu, ItemNavigation.Previous);
bool popup = item.IsPopup && keynav_state != KeyNavState.NoPopups;
SelectItem (CurrentMenu, item, popup);
if (popup) {
SelectItem (item, item.MenuItems [0], false);
CurrentMenu = item;
}
} else if (CurrentMenu.parent_menu is MainMenu) {
item = GetNextItem (CurrentMenu.parent_menu, ItemNavigation.Previous);
SelectItem (CurrentMenu.parent_menu, item, item.IsPopup);
if (item.IsPopup) {
SelectItem (item, item.MenuItems [0], false);
CurrentMenu = item;
}
} else {
HideSubPopups (CurrentMenu);
CurrentMenu = CurrentMenu.parent_menu;
}
break;
default:
throw new ArgumentException ("Invalid keyData: " + keyData);
}
}
Hashtable shortcuts = new Hashtable ();
public void AddShortcuts (MenuItem item)
{
foreach (MenuItem child in item.MenuItems) {
AddShortcuts (child);
if (child.Shortcut != Shortcut.None)
shortcuts [(int)child.Shortcut] = child;
}
if (item.Shortcut != Shortcut.None)
shortcuts [(int)item.Shortcut] = item;
}
public void RemoveShortcuts (MenuItem item)
{
foreach (MenuItem child in item.MenuItems) {
RemoveShortcuts (child);
if (child.Shortcut != Shortcut.None)
shortcuts.Remove ((int)child.Shortcut);
}
if (item.Shortcut != Shortcut.None)
shortcuts.Remove ((int)item.Shortcut);
}
bool ProcessShortcut (Keys keyData)
{
MenuItem item = shortcuts [(int)keyData] as MenuItem;
if (item == null)
return false;
Deactivate ();
item.PerformClick ();
return true;
}
public bool ProcessKeys (ref Message msg, Keys keyData)
{
if ((Msg)msg.Msg != Msg.WM_SYSKEYUP && ProcessShortcut (keyData))
return true;
else if ((keyData & Keys.KeyCode) == Keys.Menu && TopMenu is MainMenu) {
ProcessMenuKey ((Msg) msg.Msg);
return true;
} else if ((keyData & Keys.Alt) == Keys.Alt)
return ProcessMnemonic (msg, keyData);
else if ((Msg)msg.Msg == Msg.WM_SYSKEYUP || keynav_state == KeyNavState.Idle)
return false;
switch (keyData) {
case Keys.Up:
case Keys.Down:
case Keys.Right:
case Keys.Left:
ProcessArrowKey (keyData);
break;
case Keys.Escape:
Deactivate ();
break;
case Keys.Return:
ExecFocusedItem (CurrentMenu, CurrentMenu.SelectedItem);
break;
default:
ProcessMnemonic (msg, keyData);
break;
}
return true;
}
}
internal class PopUpWindow : Control
{
private Menu menu;
public PopUpWindow (Menu menu): base ()
{
this.menu = menu;
Paint += new PaintEventHandler (OnPaintPUW);
SetStyle (ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true);
SetStyle (ControlStyles.ResizeRedraw | ControlStyles.Opaque, true);
is_visible = false;
}
protected override CreateParams CreateParams
{
get {
CreateParams cp = base.CreateParams;
cp.Caption = "Menu PopUp";
cp.Style = unchecked ((int)(WindowStyles.WS_POPUP));
cp.ExStyle |= (int)(WindowStyles.WS_EX_TOOLWINDOW | WindowStyles.WS_EX_TOPMOST);
return cp;
}
}
public void ShowWindow ()
{
Show ();
RefreshItems ();
Refresh ();
}
private void OnPaintPUW (Object o, PaintEventArgs args)
{
ThemeEngine.Current.DrawPopupMenu (args.Graphics, menu, args.ClipRectangle, ClientRectangle);
}
public void HideWindow ()
{
MenuTracker.HideSubPopups (menu);
Hide ();
}
#if false
protected override bool ProcessCmdKey (ref Message msg, Keys keyData)
{
return MenuTracker.ProcessKeys (menu, ref msg, keyData, tracker);
}
#endif
protected override void CreateHandle ()
{
base.CreateHandle ();
RefreshItems ();
}
// Called when the number of items has changed
internal void RefreshItems ()
{
ThemeEngine.Current.CalcPopupMenuSize (DeviceContext, menu);
if ((Location.X + menu.Rect.Width) > SystemInformation.WorkingArea.Width) {
Location = new Point (Location.X - menu.Rect.Width, Location.Y);
}
if ((Location.Y + menu.Rect.Height) > SystemInformation.WorkingArea.Height) {
Location = new Point (Location.X, Location.Y - menu.Rect.Height);
}
Width = menu.Rect.Width;
Height = menu.Rect.Height;
}
}
}
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