Download source - 65 Kb
<!-- Article Starts -->
Features of CSizingControlBar 2.43
- Resizable control bar, that can be resized both when docked and when floating.
- Multiple sizing control bars can be docked on the same row/column.
- Full dynamic resizing, both when docked and floating, including diagonal resizing when floating.
- State persistence support (SaveState/LoadState).
- Gripper with "hide bar" flat button.
- Memory DC flickerless NC painting.
- Sample extension class with focus autosensing text caption. On Win98/Win2k, the caption is painted with gradient.
- No custom resources were used (bitmaps, cursors, strings, etc.), so the integration is easier and you have full control over the resources you eventually use in derived classes.
- Easy to use: use directly one of the CSizingControlBar* classes or derive your own control bar class, then add your child controls.
1. Include the following files in your project:
2. Add these lines to your
stdafx.h (if the files are in a different directory, include the path - see the
stdafx.h file in the samples):
3. Derive a class from
CSizingControlBarG (you have an example in
mainfrm.h, include your class' header:
then add a member variable to
5. Create the bar in CMainFrame::OnCreate(). Then set bar styles, enable it to dock... like any control bar.
if (!m_wndMyBar.Create(_T("My Bar"), this, 123)
TRACE0("Failed to create mybar\n");
CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC);
The instructions above will make a docking bar with a DevStudio-like gripper (with 2 raised lines and a hide button) when docked, and with no gripper when floating.
Let's explore some advanced features. Now we will use the
CSizingControlBarCF class as a base class, and will hide the miniframe caption, showing the gripper in the floating state too. That's possible, because
CSizingControlBarCF's gripper looks like a small caption. As a side effect of using a custom miniframe class, the resizing of the floating bar will be dynamic if "Show window contents while dragging" display property is enabled.
1. Add these files to your project too:
2. Change the
stdafx.h file to look like this:
#define baseCMyBar CSizingControlBarCF
3. Add these lines in
CMainFrame::OnCreate(), after the
m_pFloatingFrameClass = RUNTIME_CLASS(CSCBMiniDockFrameWnd);
These classes are intended to be used as base classes. Do not simply add your code to the files - instead create a new class derived from
CSizingControlBarCF and put there what you need. If you want to customize your gripper, or simply don't want a gripper, you can use
CSizingControlBar as a base class.
Window IDs: The usage of IDs in the range of
AFX_IDW_CONTROLBAR_FIRST + 32 .. AFX_IDW_CONTROLBAR_LAST is required only if the bar will not be enabled for docking (that's is - it will stay fixed right under the frame's menu). But in this situation you won't be able to fully use the features of this class, so if you will enable it to dock (a reasonable guess then you can use any valid window ID.
Another place where the IDs are important is the saving/loading of the bar's state. You must use different IDs for each control bar that is enabled to dock, and this includes the other bars too. For example, if you have two toolbars, you can create the first one with the default ID (which is
AFX_IDW_TOOLBAR = AFX_IDW_CONTROLBAR_FIRST), but the second one must have a different ID.
OnUpdateCmdUI: This member function is pure virtual in
CControlBar (the base class of
CSizingControlBar). Its purpose is to allow updating of controls at idle time (from here
CCmdUI::DoUpdate() is called for the toolbars buttons, controls on dialog bars, panes of status bar, etc.).
However, I found it very useful to update the look of the "x" flat button in
CSizingControlBarG and the color of the caption in
CSizingControlBarCF (no timers needed). So, if you will use this function, don't forget to call the base class' member (see
Dynamic resizing: This feature allows redrawing of the bar during resizing. Also all the bars are repositioned and redrawn if necessary.
SPI_GETDRAGFULLWINDOWS system parameter is queried for this (it is enabled by the "Show window contents while dragging" checkbox in Display Properties).
CBRS_SIZE_DYNAMIC: This bar style is required. Make sure you add it to the bar, otherwise the application will crash when the user floats a bar. You can add it using
Create(), or by changing the default style for
Create() to something like:
State persistence: The common MFC control bars' docking state is saved using
CMainFrame::SaveBarState(). In addition to the info saved by this function, the
CSizingControlBar class needs to save 3 sizes. This is done in
CSizingControlBar::SaveState() function, so a
m_wndMyBar.SaveState() call is required. Please note that the state storing code must be placed in
DestroyWindow(), not in
OnDestroy(), because at the time the
WM_DESTROY message is received, the floating bars are already destroyed.
m_wndMyBar.LoadState() call must be placed before
Alternatively, if you have more than one resizable bars, you can call once the static member
SizingControlBar::GlobalSaveState() instead of calling each bar's
SaveState(). The same for
LoadState() - there is a
CSizingControlBar::GlobalLoadState() function. See both samples here for more details.
Precompiler flags: There are 2 symbols which can be defined to cause the floating bars to have different appearance and functionality:
_SCB_REPLACE_MINIFRAME can be used to plug in CSCBMiniDockFrameWnd, which is a custom miniframe class. The main gain of using this class is that the floating bars can be resized dynamically, like all other windows. The other advantage is that the miniframe caption can be turned off, allowing the bar to display its own gripper, for increased functionality and/or custom designs.
If you use this flag, you have to change the
m_pFloatingFrameClass member of the main frame (see the advanced example above).
_SCB_MINIFRAME_CAPTION can be defined only if the previous flag is also defined. It causes the custom miniframe to keep the tool window caption.
CSizingControlBarCF classes do not display a gripper when floating if this flag is set.
See also www.datamekanix.com for class reference, a full changelog, FAQ, a dedicated message board and more.