Hello everybody,
I have written a little test-app because I want to develop an Xlib-based
app and didn't want to jump right in. It showed that this was a good
idea because I got stuck right at the start... :-(
-My problem is, that my code works as intended except for the part where
the window should be redrawn... :-(
To be more specific, the window is drawn correctly at first, but altough
I see the lines in the terminal showing the mouse-/keyboard-input, the
window itself is not redrawn, and if I force this by
minimizing/restoring the window, the symbol (here a simple line) showing
which section was selected with the arrow-keys, is not drawn except when
the selection is back at the first section which is the default-selection...
here's the code
#include<iostream>
#include<X11/Xlib.h>
#include<unistd.h>
int main(int argc,char** argv)
{
Display *display=XOpenDisplay(NULL);
Visual *visual=DefaultVisual(display,0);
Window
window=XCreateSimpleWindow(display,RootWindow(display,0),0,0,500,500,0,0,0);
GC gc=DefaultGC(display,0);
XMapWindow(display,window);
XSelectInput(display,window,ButtonPressMask|ExposureMask|KeyPressMask|StructureNotifyMask);
XFlush(display);
XEvent xev;
bool run=true;
int auswahl=1;
while(run) {
XNextEvent(display,&xev);
switch(xev.type) {
case Expose:
XClearWindow(display,xev.xany.window);
//XFlush(display);
XSetForeground(display,gc,0xffffffff);
XDrawString(display,window,gc,50,50,"Test1",5);
XDrawLine(display,window,gc,0,75,499,75);
XDrawString(display,window,gc,50,100,"Test2",5);
XDrawLine(display,window,gc,0,125,499,125);
XDrawString(display,window,gc,50,150,"Test3",5);
XDrawLine(display,window,gc,150,auswahl*50-25,200,auswahl*50-25);
//XFlush(display);
std::cout<<"Auswahl="<<auswahl<<"
count="<<xev.xexpose.count<<std::endl;
break;
case ButtonPress:
std::cout<<"ButtonPress at
("<<xev.xbutton.x<<","<<xev.xbutton.y<<")"<<std::endl;
if(xev.xbutton.y<75) std::cout<<"Test1"<<std::endl;
else if(xev.xbutton.y>75 && xev.xbutton.y<125)
std::cout<<"Test2"<<std::endl;
else if(xev.xbutton.y>125) std::cout<<"Test3"<<std::endl;
XDrawLine(display,window,gc,250,250,xev.xbutton.x,xev.xbutton.y);
break;
case KeyPress:
std::cout<<"KeyPress:"<<xev.xkey.keycode<<std::endl;
switch(xev.xkey.keycode) {
case 9: //ESC
std::cout<<"ESC"<<std::endl;
run=false;
break;
case 111: //rauf
std::cout<<"hoch";
auswahl--;
if(auswahl==0) auswahl=3;
std::cout<<auswahl<<std::endl;
break;
case 116: //runter
std::cout<<"runter";
auswahl++;
if(auswahl==4) auswahl=1;
std::cout<<auswahl<<std::endl;
break;
}
//XFlush(display);
//XSync(display,false);
//XMapWindow(display,window);
//XClearWindow(display,window);
break;
default:
std::cout<<"unrecognized Event "<<xev.type<<std::endl;
}
std::cout<<"."<<std::endl;
}
return 0;
}
-I have read every (and I mean every) page, google suggest for this
problem, but none really did help me... -so every help/hint/suggestion
is very much appreciated :-)
-Marcus
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