How to change the position of the Vertical Scrollbar of a window?
I'm referring to the position in xy, for example set it in the middle of the window instead of the edges.
You cannot reposition a scrollbar that is built-in to a window. You will have to disable the native scrollbar (remove the window's WS_HSCROLL/WS_VSCROLL style) and then create a separate ScrollBar control as a child of the window. Then you can position that child wherever you want, using the x/y parameters of CreateWindow/Ex() or SetWindowPos().
Related
I have a LayeredWindow GUI that contains some child's and all of them contains the WS_EX_TRANSPARENT style.
The style is used to be able to remove their background.
When i move the mouse over the GUI only the LayeredWindow receives the message WM_MOUSEMOVE.
I tried calling ChildWindowFromPointEx using the XY pos got from the WM_MOUSEMOVE lParam
to detect the control being hovered, but the API didn't recognize any of the controls belonging to the child GUI's.
Docs says:
The search is restricted to immediate child windows. Grandchildren and deeper descendants are not searched.
The other option i tried was EnumChildWindow and compare each control rect to the XY position of the message, this method is using around 1% of CPU only from moving the mouse.
I wonder if there's any 'better' option?
According to the Doc:Layered Windows
Hit testing of a layered window is based on the shape and transparency
of the window. This means that the areas of the window that are
color-keyed or whose alpha value is zero will let the mouse messages
through. However, if the layered window has the WS_EX_TRANSPARENT
extended window style, the shape of the layered window will be ignored
and the mouse events will be passed to other windows underneath the
layered window.
You could try to use GetCursorPos function to get the position of the mouse cursor, in screen coordinates.
I've got a variety of wxPanels contained in a main wxPanel which is in turn contained in a wxFrame.
I'm trying to set a custom cursor over all the children by calling SetCursor on the wxFrame that contains everything and it mostly works except when the mouse is over the children's border.
When the mouse is over a border, it reverts to the arrow.
Each border is set to wxBORDER_RAISED.
How do I make sure that my cursor is the same over a panel's borders as it is over the panel itself?
Here's how I set the cursor:
In my wxFrame
wxCursor wMyCursor(wCursorFilename, wxBITMAP_TYPE_CUR);
SetCursor(wMyCursor);
//tried this as well
wMainPanel->SetCursor(wMyCursor);
An other way of putting it might be "how do I set a custom cursor when the mouse is over a panel's border"?
cheers
I've got a QGraphicsView with a vertical Scrollbar, but the problem is that when I run my app, the scrollbar position is set to the center of the QGraphicsView.
How can I set it to the top by default ?
I tried to use :
view->verticalScrollBar()->setValue(0);
But it doesn't change a thing. However, I tried this too :
view->verticalScrollBar()->setValue(1);
And it does change the Scrollbar Position to the top, but not at its minimum.
How would i make a button that will change it's position on MouseMove Event if the cursor is close enough to the center of the button in MFC ?
WM_MOUSEMOVE is not delivered to the button if the cursor is not over it (and is not captured, but you don't want that). So you have to process WM_MOUSEMOVE in the parent dialog. If you want your button to be a self-contained control, you have to subclass the parent window upon button creation.
Subclassing, in this context, means:
- you retrieve and store the parent's window proc address with GetParent()->GetWindowLong(GWL_WNDPROC)
- you set it to your procedure with SetWindowLong()
- in the procedure, you call the parent's previous window proc, after handling WM_MOUSEMOVE the way you want.
The WM_MOUSEMOVE coordinates will be relative to the screen, but you'll probably want to track the button position relative to the window that contains it. Use the ScreenToClient method on the parent window to convert, then you can compare the coordinates to see if it's close. Then use MoveWindow to move the button.
If you track the mouse cursor position you can determine when the cursor gets close to or enters the button window rect. You can then use the SetWindowPos() function to reposition the button window in the parent window client area.
Currently I'm repositioning dialog controls when the dialog is resized like this:
// Get the list control rect.
CRect listRect;
list->GetWindowRect(&listRect);
ScreenToClient(listRect);
// Get the dialog Rect.
CRect dialogRect;
GetWindowRect(&dialogRect);
ScreenToClient(dialogRect);
list->MoveWindow(listRect.left, listRect.top,
dialogRect.right - (2 * listRect.left), dialogRect.bottom - 100);
This works great in Windows XP, but when I tried in Windows Vista the positioning was off. I think this must be down to larger dialog borders and captions in Windows Vista dialogs, and the fact that GetWindowRect has the following entry in the documentation:
The dimensions are given in screen coordinates relative to the upper-left corner of the display screen. The dimensions of the caption, border, and scroll bars, if present, are included.
So my question is, how do I reposition dialog controls when resizing a dialog so that they are consistent between operating systems? Thanks
You should use GetClientRect instead of GetWindowRect followed by ScreenToClient -- the former returns the extents of the client part of the window (i.e. without borders), whereas the latter retrieves the extents of the whole window including non-client parts (albeit in client coordinates).
// Get the list control rect.
CRect listRect;
list->GetWindowRect(&listRect);
dlg->ScreenToClient(&listRect);
// Get the dialog Rect.
CRect dialogRect;
dlg->GetClientRect(&dialogRect);
list->MoveWindow(listRect.left, listRect.top, dialogRect.right - (2 * listRect.left), dialogRect.bottom - 100);