enlarging a window produces clipping

This is a discussion on enlarging a window produces clipping within the Linux Programming forums, part of the Platform Specific Boards category; Hello, I am studying X, and confused some problems. If I enlarge the window, the drawing is clipped to the ...

  1. #1
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    enlarging a window produces clipping

    Hello,
    I am studying X, and confused some problems. If I enlarge the window, the drawing is clipped to the size of the window before enlarging. there is a test program

    Code:
    #include <X11/Xlib.h>
    #include <iostream>
    
    int main()
    {
    	// Open the display
    	Display *dpy = XOpenDisplay(NIL);
    	Window desktop = DefaultRootWindow(dpy);
    
    	// Get some colors
    	int whiteColor = WhitePixel(dpy, DefaultScreen(dpy));
    
    
    	// Create the window
    	hwnd_t wnd = XCreateSimpleWindow(dpy, desktop,
    
    										10, 10, 300, 200, 0,0,
    
    										whiteColor);
    
    
    
    	XSelectInput(dpy, wnd, StructureNotifyMask | ButtonPressMask | ExposureMask| ResizeRedirectMask); //POINT A
    
          XMapWindow(dpy, wnd);
    
          XFlush(dpy);
    
    	XEvent event;
    	while(true)
    	{
    		XNextEvent(dpy, &event);
    		switch(event.type)
    		{
    		case ButtonPress:
    			std::cout<<"button clicked"<<std::endl;
    		}
    	}
    }
    the code shows when a mouse clicked on the window, it prints "button clicked" in terminal. but after enlarging the window, the event just effects the original rectangle before enlarging, if a mouse clicked on the new rectangle, "button clicked" is not printed in terminal.

    at the comment POINT A, if i modify the line to
    XSelectInput(dpy, wnd, StructureNotifyMask | ButtonPressMask | ExposureMask);
    the window is allright. please show me a solution on the problem.

    thanks in advance
    Nana C++ Library is a GUI framework that designed to be C++ style, cross-platform and easy-to-use.

  2. #2
    and the hat of wrongness Salem's Avatar
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    > switch(event.type)
    You need to respond to resize events as well (I guess).
    Been over a decade since I last rummaged in low-level X11
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  3. #3
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    Sorry, I don't know what your meaning is...
    essentially, i think iit is ResizeRedirectMask
    Nana C++ Library is a GUI framework that designed to be C++ style, cross-platform and easy-to-use.

  4. #4
    and the hat of wrongness Salem's Avatar
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    Code:
    		case default:
    			std::cout<<"An ignored event"<<std::endl;
    Get many of these?
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  5. #5
    Registered User
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    >>Get many of these?

    yes. if i resize the window
    Nana C++ Library is a GUI framework that designed to be C++ style, cross-platform and easy-to-use.

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