CODEWITHSUNDEEP
swtjface
user2458032
user2458032

Reputation: 41

SWT/JFACE progress bar in splash screen stop update while running external process in application

I Have problem with application that invoke splash screen with progrss bar during initialization, this is part of code inside my app,

try {
            Runtime runTime = Runtime.getRuntime();
            pbaw = runTime.exec(cmdGen);
            //pbaw = probuilder.start();
            try {
                String line;
                BufferedReader input =
                        new BufferedReader(new InputStreamReader(pbaw.getInputStream()));
                SplashScreen ss= new SplashScreen(Display.getCurrent(), getShell());
                int progress = 0;
                ss.show();
                while ((line = input.readLine()) != null) {
                    ss.setLabel(line);
                    progress+=1;
                    ss.advance(progress);
                    //System.out.println(line); //<-- Parse data here.
                }
                input.close();
                ss.destroy(pbaw.waitFor());
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

my question is why the progrss bar in splash screen can not update while i click in desktop or running other application, but my applicatin can run perfectly, please help ??? here part of my splash scrren code to make it clear,

void advance(final int progress) {
                if (!progressBar.isDisposed()) {
                    progressBar.setSelection(progress);//progressBar.getSelection() + progress);
                    progressBar.redraw();
                }
            }

            public void show() {
                mainShell.pack();
                mainShell.open();

            }

            void destroy(int val) {
                if (val==0){
                    splashComposite.dispose();
                    if (appImage != null) {
                        appImage.dispose();
                    }
                    mainShell.dispose();
                }
            }

Upvotes: 0

Views: 210

Answers (1)

greg-449
greg-449

Reputation: 111216

You are running your code in the User Interface thread and never giving SWT a chance to update. You need to run your reading code in a separate thread and use Display.asyncExec to update the splash screen in the UI thread.

Upvotes: 1

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