public MenuControl()
{
// Set default values
this.Dock = DockStyle.Top;
_trackItem = -1;
_selected = false;
_multiLine = false;
_popupMenu = null;
_mouseOver = false;
_manualFocus = false;
_drawUpwards = false;
_plainAsBlock = false;
_oldFocus = IntPtr.Zero;
_ignoreEscapeUp = false;
_ignoreMouseMove = false;
_dismissTransfer = false;
_style = VisualStyle.IDE;
_chevronStartCommand = null;
_direction = Direction.Horizontal;
_menuCommands = new MenuCommandCollection();
// Prevent flicker with double buffering and all painting inside WM_PAINT
SetStyle(ControlStyles.DoubleBuffer, true);
SetStyle(ControlStyles.AllPaintingInWmPaint, true);
// Should not be allowed to select this control
SetStyle(ControlStyles.Selectable, false);
// Hookup to collection events
_menuCommands.Cleared += new CollectionWithEvents.CollectionClear(OnCollectionCleared);
_menuCommands.Inserted += new CollectionWithEvents.CollectionChange(OnCollectionInserted);
_menuCommands.Removed += new CollectionWithEvents.CollectionChange(OnCollectionRemoved);
// Set the default menu color as background
this.BackColor = SystemColors.Control;
// Do not allow tab key to select this control
this.TabStop = false;
// Default the Font we use
this.Font = SystemInformation.MenuFont;
// Calculate the initial height/width of the control
_rowWidth = _rowHeight = this.Font.Height + _breadthGap * 2 + 1;
// Default to one line of items
this.Height = _rowHeight;
// Add ourself to the application filtering list
Application.AddMessageFilter(this);
}
protected override void OnMouseDown(MouseEventArgs e)
{
Point pos = new Point(e.X, e.Y);
for(int i=0; i<_drawCommands.Count; i++)
{
DrawCommand dc = _drawCommands[i] as DrawCommand;
// Find the DrawCommand this is over
if (dc.DrawRect.Contains(pos))
{
// Is an item already selected?
if (_selected)
{
// Is it this item that is already selected?
if (_trackItem == i)
{
// Is a popupMenu showing
if (_popupMenu != null)
{
// Dismiss the submenu
_popupMenu.Dismiss();
// No reference needed
_popupMenu = null;
}
}
}
else
{
// Select the tracked item
_selected = true;
_drawUpwards = false;
GrabTheFocus();
// Is there a change in tracking?
if (_trackItem != i)
{
// Modify the display of the two items
_trackItem = SwitchTrackingItem(_trackItem, i);
}
else
{
// Update display to show as selected
DrawCommand(_trackItem, true);
}
// Is there a submenu to show?
if (dc.Chevron || (dc.MenuCommand.MenuCommands.Count > 0))
WindowsAPI.PostMessage(this.Handle, WM_OPERATEMENU, 1, 0);
}
break;
}
}
base.OnMouseDown(e);
}
internal void OperateSubMenu(DrawCommand dc, bool selectFirst, bool trackRemove)
{
Rectangle drawRect = dc.DrawRect;
// Find screen positions for popup menu
Point screenPos;
if (_style == VisualStyle.IDE)
{
if (_direction == Direction.Horizontal)
screenPos = PointToScreen(new Point(dc.DrawRect.Left + 1, drawRect.Bottom - _lengthGap - 1));
else
screenPos = PointToScreen(new Point(dc.DrawRect.Right - _breadthGap, drawRect.Top + _boxExpandSides - 1));
}
else
{
if (_direction == Direction.Horizontal)
screenPos = PointToScreen(new Point(dc.DrawRect.Left + 1, drawRect.Bottom));
else
screenPos = PointToScreen(new Point(dc.DrawRect.Right, drawRect.Top));
}
Point aboveScreenPos;
if (_style == VisualStyle.IDE)
{
if (_direction == Direction.Horizontal)
aboveScreenPos = PointToScreen(new Point(dc.DrawRect.Left + 1, drawRect.Top + _lengthGap + 1));
else
aboveScreenPos = PointToScreen(new Point(dc.DrawRect.Right - _breadthGap, drawRect.Bottom + _lengthGap));
}
else
{
if (_direction == Direction.Horizontal)
aboveScreenPos = PointToScreen(new Point(dc.DrawRect.Left + 1, drawRect.Top));
else
aboveScreenPos = PointToScreen(new Point(dc.DrawRect.Right, drawRect.Bottom));
}
int borderGap;
// Calculate the missing gap in the PopupMenu border
if (_direction == Direction.Horizontal)
borderGap = dc.DrawRect.Width - _subMenuBorderAdjust;
else
borderGap = dc.DrawRect.Height - _subMenuBorderAdjust;
_popupMenu = new PopupMenu();
// Define the correct visual style based on ours
_popupMenu.Style = this.Style;
// Key direction when keys cause dismissal
int returnDir = 0;
if (dc.Chevron)
{
MenuCommandCollection mcc = new MenuCommandCollection();
bool addCommands = false;
// Generate a collection of menu commands for those not visible
foreach(MenuCommand command in _menuCommands)
{
if (!addCommands && (command == _chevronStartCommand))
addCommands = true;
if (addCommands)
mcc.Add(command);
}
// Track the popup using provided menu item collection
_popupMenu.TrackPopup(screenPos,
aboveScreenPos,
_direction,
mcc,
borderGap,
selectFirst,
this,
ref returnDir);
}
else
{
// Generate event so that caller has chance to modify MenuCommand contents
OnPopupStart(dc.MenuCommand);
// Track the popup using provided menu item collection
_popupMenu.TrackPopup(screenPos,
aboveScreenPos,
_direction,
dc.MenuCommand.MenuCommands,
borderGap,
selectFirst,
this,
ref returnDir);
// Generate event so that caller has chance to modify MenuCommand contents
OnPopupEnd(dc.MenuCommand);
}
// Remove unwanted object
_popupMenu = null;
// Was arrow key used to dismiss the submenu?
if (returnDir != 0)
{
// Using keyboard movements means we should have the focus
if (!_manualFocus)
{
_manualFocus = true;
GrabTheFocus();
}
if (returnDir < 0)
{
// Shift selection left one
ProcessMoveLeft(true);
}
else
{
// Shift selection right one
ProcessMoveRight(true);
}
// A WM_MOUSEMOVE is generated when we open up the new submenu for
// display, ignore this as it causes the selection to move
_ignoreMouseMove = true;
}
else
{
// Only if the submenu was dismissed at the request of the submenu
// should the selection mode be cancelled, otherwise keep selection mode
if (!_dismissTransfer)
{
// This item is no longer selected
_selected = false;
_drawUpwards = false;
// Should we stop tracking this item
if (trackRemove)
{
ReturnTheFocus();
// Unselect the current item
_trackItem = SwitchTrackingItem(_trackItem, -1);
}
else
{
// Repaint the item
DrawCommand(_trackItem, true);
}
}
else
{
// Do not change _selected status
_dismissTransfer = false;
}
}
}
protected MenuCommand InternalTrackPopup(Point screenPosTR, Point screenPosTL,
MenuCommandCollection menuCollection,
PopupMenu parentMenu, bool selectFirst,
MenuControl parentControl, bool popupRight,
bool popupDown, ref int returnDir)
{
// Default the drawing direction
_direction = Direction.Horizontal;
// Remember the MenuControl that initiated us
_parentControl = parentControl;
// We have a parent popup menu that should be consulted about operation
_parentMenu = parentMenu;
// Remember any currect menu item collection
MenuCommandCollection oldCollection = _menuCommands;
// Use the passed in collection of menu commands
_menuCommands = menuCollection;
// Remember screen positions
_screenPos = screenPosTR;
_aboveScreenPos = screenPosTR;
_leftScreenPos = screenPosTL;
// Remember display directions
_popupRight = popupRight;
_popupDown = popupDown;
MenuCommand ret = InternalTrackPopup(selectFirst);
// Restore to original collection
_menuCommands = oldCollection;
// Remove references no longer required
_parentControl = null;
_parentMenu = null;
// Return the direction key that caused dismissal
returnDir = _returnDir;
return ret;
}
protected void OperateSubMenu(int popupItem, bool selectFirst)
{
_popupItem = popupItem;
_childMenu = new PopupMenu();
DrawCommand dc = _drawCommands[popupItem] as DrawCommand;
// Find screen coordinate of Top right of item cell
Win32.POINT screenPosTR;
screenPosTR.x = dc.DrawRect.Right;
screenPosTR.y = dc.DrawRect.Top;
WindowsAPI.ClientToScreen(this.Handle, ref screenPosTR);
// Find screen coordinate of top left of item cell
Win32.POINT screenPosTL;
screenPosTL.x = dc.DrawRect.Left;
screenPosTL.y = dc.DrawRect.Top;
WindowsAPI.ClientToScreen(this.Handle, ref screenPosTL);
// Ensure the child has the same properties as ourself
_childMenu.Style = this.Style;
_childMenu.Font = this.Font;
// Record keyboard direction
int returnDir = 0;
_returnCommand = _childMenu.InternalTrackPopup(new Point(screenPosTR.x, screenPosTR.y),
new Point(screenPosTL.x, screenPosTL.y),
dc.MenuCommand.MenuCommands,
this,
selectFirst,
_parentControl,
_popupRight,
_popupDown,
ref returnDir);
_popupItem = -1;;
_childMenu = null;
if ((_returnCommand != null) || (returnDir != 0))
{
// Finish processing messages
_timer.Stop();
_exitLoop = true;
_returnDir = returnDir;
}
}
public PopupMenu()
{
// Create collection objects
_drawCommands = new ArrayList();
_menuCommands = new MenuCommandCollection();
// Default the properties
_returnDir = 0;
_extraSize = 0;
_popupItem = -1;
_trackItem = -1;
_childMenu = null;
_exitLoop = false;
_popupDown = true;
_mouseOver = false;
_grabFocus = false;
_excludeTop = true;
_popupRight = true;
_parentMenu = null;
_excludeOffset = 0;
_focusCatcher = null;
_parentControl = null;
_returnCommand = null;
_oldFocus = IntPtr.Zero;
_showInfrequent = false;
_style = VisualStyle.IDE;
_lastMousePos = new Point(-1,-1);
_direction = Direction.Horizontal;
_textFont = SystemInformation.MenuFont;
// Create and initialise the timer object (but do not start it running!)
_timer = new Timer();
_timer.Interval = _selectionDelay;
_timer.Tick += new EventHandler(OnTimerExpire);
}
