Re: Problem with continuous image updation

[Alexander <b3nder yandex ru>]

On Wednesday 18 March 2009, Adeel Malik wrote:
> In my application, I am implementing status indication (displaying either 'red' or 'green' ) by using 
> Gdkpixmap to assign an image to 'red' or 'green' pixel array. I display or hide the image by calling 
> gtk_widget_show (..) or gtk_widget_hide(..) once the start button is clicked in the main gtk window.
> The structure of my application is as follows:
>  int main()
> {
> 1.  Assign Pixmaps
> 2. Set up the start button
> 3. Wait for the start button press
> 3. rest in gtk_main ()
> }
> button_function(...)
> {
>  
> //while loop
> while (...)
> {
> ..
> if status=0
> {
> gtk_widget_hide(green);
> gtk_widget_show(red);
> }
> else
> {
>
> gtk_widget_hide(red);
> gtk_widget_show(green);
> ....
> }
> It appears that gtk is not upating the image during the whole course of while loop (which is running at 
> just 15 cycles/s) based on 'status' variable. However, afer the while loop is finished, I get the updated 
> status image. Could someone suggest what additonal gtk calls I have to make to make sure that the status 
> image is updated (red or green) whenever there is a change in the value of status variable in the while 
> loop of ' start button' function.

I think this is bad idea using two widgets for your task. Nevertheless
gdk_window_process_updates () call may help just after gtk_widget_show();