/// <summary>Hook callback to process <see cref="WM.WM_MOUSEMOVE" /> messages to highlight/un-highlight the close button on each tab.</summary>
/// <param name="nCode">The message being received.</param>
/// <param name="wParam">Additional information about the message.</param>
/// <param name="lParam">Additional information about the message.</param>
/// <returns>A zero value if the procedure processes the message; a nonzero value if the procedure ignores the message.</returns>
protected IntPtr MouseHookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0 && (int) WM.WM_MOUSEMOVE == (int) wParam)
{
MSLLHOOKSTRUCT hookStruct = (MSLLHOOKSTRUCT) Marshal.PtrToStructure(lParam, typeof (MSLLHOOKSTRUCT));
Point cursorPosition = new Point(hookStruct.pt.x, hookStruct.pt.y);
bool reRender = false;
if (_tornTab != null)
{
// ReSharper disable ForCanBeConvertedToForeach
for (int i = 0; i < _dropAreas.Length; i++)
// ReSharper restore ForCanBeConvertedToForeach
{
// If the cursor is within the drop area, combine the tab for the window that belongs to that drop area
if (_dropAreas[i].Item2.Contains(cursorPosition))
{
lock (_tornTabLock)
{
if (_tornTab != null)
{
_dropAreas[i].Item1.TabRenderer.CombineTab(_tornTab, cursorPosition);
_tornTab = null;
_tornTabForm.Close();
_tornTabForm = null;
if (_parentForm.Tabs.Count == 0)
_parentForm.Close();
}
}
}
}
}
else if (!_parentForm.TabRenderer.IsTabRepositioning)
{
// If we were over a close button previously, check to see if the cursor is still over that tab's
// close button; if not, re-render
if (_isOverCloseButtonForTab != -1 &&
(_isOverCloseButtonForTab >= _parentForm.Tabs.Count ||
!_parentForm.TabRenderer.IsOverCloseButton(_parentForm.Tabs[_isOverCloseButtonForTab], GetRelativeCursorPosition(cursorPosition))))
{
reRender = true;
_isOverCloseButtonForTab = -1;
}
// Otherwise, see if any tabs' close button is being hovered over
else
{
// ReSharper disable ForCanBeConvertedToForeach
for (int i = 0; i < _parentForm.Tabs.Count; i++)
// ReSharper restore ForCanBeConvertedToForeach
{
if (_parentForm.TabRenderer.IsOverCloseButton(_parentForm.Tabs[i], GetRelativeCursorPosition(cursorPosition)))
{
_isOverCloseButtonForTab = i;
reRender = true;
break;
}
}
}
}
else
{
_wasDragging = true;
// When determining if a tab has been torn from the window while dragging, we take the drop area for this window and inflate it by the
// TabTearDragDistance setting
Rectangle dragArea = TabDropArea;
dragArea.Inflate(_parentForm.TabRenderer.TabTearDragDistance, _parentForm.TabRenderer.TabTearDragDistance);
// If the cursor is outside the tear area, tear it away from the current window
if (!dragArea.Contains(cursorPosition) && _tornTab == null)
{
lock (_tornTabLock)
{
if (_tornTab == null)
{
_parentForm.TabRenderer.IsTabRepositioning = false;
// Clear the event handler subscriptions from the tab and then create a thumbnail representation of it to use when dragging
_tornTab = _parentForm.SelectedTab;
_tornTab.ClearSubscriptions();
_tornTabForm = new TornTabForm(_tornTab, _parentForm.TabRenderer);
_parentForm.SelectedTabIndex = (_parentForm.SelectedTabIndex == _parentForm.Tabs.Count - 1
? _parentForm.SelectedTabIndex - 1
: _parentForm.SelectedTabIndex + 1);
_parentForm.Tabs.Remove(_tornTab);
// If this tab was the only tab in the window, hide the parent window
if (_parentForm.Tabs.Count == 0)
_parentForm.Hide();
_tornTabForm.Show();
_dropAreas = (from window in _parentForm.ApplicationContext.OpenWindows.Where(w => w.Tabs.Count > 0)
select new Tuple<TitleBarTabs, Rectangle>(window, window.TabDropArea)).ToArray();
}
}
}
}
OnMouseMove(new MouseEventArgs(MouseButtons.None, 0, cursorPosition.X, cursorPosition.Y, 0));
if (_parentForm.TabRenderer.IsTabRepositioning)
reRender = true;
if (reRender)
Render(cursorPosition, true);
}
else if (nCode >= 0 && (int) WM.WM_LBUTTONDOWN == (int) wParam)
_wasDragging = false;
else if (nCode >= 0 && (int) WM.WM_LBUTTONUP == (int) wParam)
{
// If we released the mouse button while we were dragging a torn tab, put that tab into a new window
if (_tornTab != null)
{
lock (_tornTabLock)
{
if (_tornTab != null)
{
TitleBarTabs newWindow = (TitleBarTabs) Activator.CreateInstance(_parentForm.GetType());
// Set the initial window position and state properly
if (newWindow.WindowState == FormWindowState.Maximized)
{
Screen screen = Screen.AllScreens.First(s => s.WorkingArea.Contains(Cursor.Position));
newWindow.StartPosition = FormStartPosition.Manual;
newWindow.WindowState = FormWindowState.Normal;
newWindow.Left = screen.WorkingArea.Left;
newWindow.Top = screen.WorkingArea.Top;
newWindow.Width = screen.WorkingArea.Width;
newWindow.Height = screen.WorkingArea.Height;
}
else
{
newWindow.Left = Cursor.Position.X;
newWindow.Top = Cursor.Position.Y;
}
_tornTab.Parent = newWindow;
_parentForm.ApplicationContext.OpenWindow(newWindow);
newWindow.Show();
newWindow.Tabs.Add(_tornTab);
newWindow.SelectedTabIndex = 0;
newWindow.ResizeTabContents();
_tornTab = null;
_tornTabForm.Close();
_tornTabForm = null;
if (_parentForm.Tabs.Count == 0)
_parentForm.Close();
}
}
}
OnMouseUp(new MouseEventArgs(MouseButtons.Left, 1, Cursor.Position.X, Cursor.Position.Y, 0));
}
return User32.CallNextHookEx(_hookId, nCode, wParam, lParam);
}
/// <summary>
/// Consumer method that processes mouse events in <see cref="_mouseEvents" /> that are recorded by <see cref="MouseHookCallback" />.
/// </summary>
protected void InterpretMouseEvents()
{
foreach (MouseEvent mouseEvent in _mouseEvents.GetConsumingEnumerable())
{
int nCode = mouseEvent.nCode;
IntPtr wParam = mouseEvent.wParam;
MSLLHOOKSTRUCT? hookStruct = mouseEvent.MouseData;
if (nCode >= 0 && (int) WM.WM_MOUSEMOVE == (int) wParam)
{
// ReSharper disable PossibleInvalidOperationException
Point cursorPosition = new Point(hookStruct.Value.pt.x, hookStruct.Value.pt.y);
// ReSharper restore PossibleInvalidOperationException
bool reRender = false;
if (_tornTab != null)
{
// ReSharper disable ForCanBeConvertedToForeach
for (int i = 0; i < _dropAreas.Length; i++)
// ReSharper restore ForCanBeConvertedToForeach
{
// If the cursor is within the drop area, combine the tab for the window that belongs to that drop area
if (_dropAreas[i].Item2.Contains(cursorPosition))
{
TitleBarTab tabToCombine = null;
lock (_tornTabLock)
{
if (_tornTab != null)
{
tabToCombine = _tornTab;
_tornTab = null;
}
}
if (tabToCombine != null)
{
int i1 = i;
// In all cases where we need to affect the UI, we call Invoke so that those changes are made on the main UI thread since
// we are on a separate processing thread in this case
Invoke(
new Action(
() =>
{
_dropAreas[i1].Item1.TabRenderer.CombineTab(tabToCombine, cursorPosition);
tabToCombine = null;
_tornTabForm.Close();
_tornTabForm = null;
if (_parentForm.Tabs.Count == 0)
_parentForm.Close();
}));
}
}
}
}
else if (!_parentForm.TabRenderer.IsTabRepositioning)
{
// If we were over a close button previously, check to see if the cursor is still over that tab's
// close button; if not, re-render
if (_isOverCloseButtonForTab != -1 &&
(_isOverCloseButtonForTab >= _parentForm.Tabs.Count ||
!_parentForm.TabRenderer.IsOverCloseButton(_parentForm.Tabs[_isOverCloseButtonForTab], GetRelativeCursorPosition(cursorPosition))))
{
reRender = true;
_isOverCloseButtonForTab = -1;
}
// Otherwise, see if any tabs' close button is being hovered over
else
{
// ReSharper disable ForCanBeConvertedToForeach
for (int i = 0; i < _parentForm.Tabs.Count; i++)
// ReSharper restore ForCanBeConvertedToForeach
{
if (_parentForm.TabRenderer.IsOverCloseButton(_parentForm.Tabs[i], GetRelativeCursorPosition(cursorPosition)))
{
_isOverCloseButtonForTab = i;
reRender = true;
break;
}
}
}
}
else
{
Invoke(
new Action(
() =>
{
_wasDragging = true;
// When determining if a tab has been torn from the window while dragging, we take the drop area for this window and inflate it by the
// TabTearDragDistance setting
Rectangle dragArea = TabDropArea;
dragArea.Inflate(_parentForm.TabRenderer.TabTearDragDistance, _parentForm.TabRenderer.TabTearDragDistance);
// If the cursor is outside the tear area, tear it away from the current window
if (!dragArea.Contains(cursorPosition) && _tornTab == null)
{
lock (_tornTabLock)
{
if (_tornTab == null)
{
_parentForm.TabRenderer.IsTabRepositioning = false;
// Clear the event handler subscriptions from the tab and then create a thumbnail representation of it to use when dragging
_tornTab = _parentForm.SelectedTab;
_tornTab.ClearSubscriptions();
_tornTabForm = new TornTabForm(_tornTab, _parentForm.TabRenderer);
}
}
if (_tornTab != null)
{
_parentForm.SelectedTabIndex = (_parentForm.SelectedTabIndex == _parentForm.Tabs.Count - 1
? _parentForm.SelectedTabIndex - 1
: _parentForm.SelectedTabIndex + 1);
_parentForm.Tabs.Remove(_tornTab);
// If this tab was the only tab in the window, hide the parent window
if (_parentForm.Tabs.Count == 0)
_parentForm.Hide();
_tornTabForm.Show();
_dropAreas = (from window in _parentForm.ApplicationContext.OpenWindows.Where(w => w.Tabs.Count > 0)
select new Tuple<TitleBarTabs, Rectangle>(window, window.TabDropArea)).ToArray();
}
}
}));
}
Invoke(new Action(() => OnMouseMove(new MouseEventArgs(MouseButtons.None, 0, cursorPosition.X, cursorPosition.Y, 0))));
if (_parentForm.TabRenderer.IsTabRepositioning)
reRender = true;
if (reRender)
Invoke(new Action(() => Render(cursorPosition, true)));
}
else if (nCode >= 0 && (int) WM.WM_LBUTTONDOWN == (int) wParam)
_wasDragging = false;
else if (nCode >= 0 && (int) WM.WM_LBUTTONUP == (int) wParam)
{
// If we released the mouse button while we were dragging a torn tab, put that tab into a new window
if (_tornTab != null)
{
TitleBarTab tabToRelease = null;
lock (_tornTabLock)
{
if (_tornTab != null)
{
tabToRelease = _tornTab;
_tornTab = null;
}
}
if (tabToRelease != null)
{
Invoke(
new Action(
() =>
{
TitleBarTabs newWindow = (TitleBarTabs) Activator.CreateInstance(_parentForm.GetType());
// Set the initial window position and state properly
if (newWindow.WindowState == FormWindowState.Maximized)
{
Screen screen = Screen.AllScreens.First(s => s.WorkingArea.Contains(Cursor.Position));
newWindow.StartPosition = FormStartPosition.Manual;
newWindow.WindowState = FormWindowState.Normal;
newWindow.Left = screen.WorkingArea.Left;
newWindow.Top = screen.WorkingArea.Top;
newWindow.Width = screen.WorkingArea.Width;
newWindow.Height = screen.WorkingArea.Height;
}
else
{
newWindow.Left = Cursor.Position.X;
newWindow.Top = Cursor.Position.Y;
}
tabToRelease.Parent = newWindow;
_parentForm.ApplicationContext.OpenWindow(newWindow);
newWindow.Show();
newWindow.Tabs.Add(tabToRelease);
newWindow.SelectedTabIndex = 0;
newWindow.ResizeTabContents();
_tornTabForm.Close();
_tornTabForm = null;
if (_parentForm.Tabs.Count == 0)
_parentForm.Close();
}));
}
}
Invoke(new Action(() => OnMouseUp(new MouseEventArgs(MouseButtons.Left, 1, Cursor.Position.X, Cursor.Position.Y, 0))));
}
}
}