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 CollectionClear( OnCollectionCleared );
_menuCommands.Inserted+= new CollectionChange( OnCollectionInserted );
_menuCommands.Removed += new 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 void InternalConstruct(string text, ImageList imageList, int imageIndex,
Shortcut shortcut, EventHandler clickHandler, Bitmap bitmap, object realOwner)
{
// Save parameters
this.text = text;
this.imageList = imageList;
this.imageIndex = imageIndex;
this.shortcut = shortcut;
image = bitmap;
this.realOwner = realOwner;
this.comboBox = null;
if( clickHandler != null )
{
Click += clickHandler;
}
// Define defaults for others
enabled = true;
_checked = false;
radioCheck = false;
_break = false;
userData = null;
visible = true;
infrequent = false;
// Create the collection of embedded menu commands
menuItems = new MenuCommandCollection();
}
protected bool GenerateShortcut(Shortcut sc, MenuCommandCollection mcc)
{
foreach(MenuCommand mc in mcc)
{
// Does the command match?
if (mc.Enabled && (mc.Shortcut == sc))
{
// Generate event for command
mc.OnClick(EventArgs.Empty);
return true;
}
else
{
// Any child items to test?
if (mc.MenuCommands.Count > 0)
{
// Recursive descent of all collections
if (GenerateShortcut(sc, mc.MenuCommands))
return true;
}
}
}
return false;
}
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;
}
internal MenuCommand TrackPopup(Point screenPos, Point aboveScreenPos,
Direction direction,
MenuCommandCollection menuCollection,
int borderGap,
bool selectFirst,
MenuControl parentControl,
ref int returnDir)
{
// Remember which direction the MenuControl is drawing in
direction = direction;
// Remember the MenuControl that initiated us
parentControl = parentControl;
// Remember the gap in drawing the top border
borderGap = borderGap;
// Remember any currect menu item collection
MenuCommandCollection oldCollection = menuCommands;
// Use the passed in collection of menu commands
menuCommands = menuCollection;
// Remember screen positions
screenPos = screenPos;
aboveScreenPos = aboveScreenPos;
leftScreenPos = screenPos;
MenuCommand ret = InternalTrackPopup(selectFirst);
// Restore to original collection
menuCommands = oldCollection;
// Remove reference no longer required
parentControl = null;
// Return the direction key that caused dismissal
returnDir = returnDir;
return ret;
}
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);
}
