src/libs/print/libprint/DialogWindow.cpp

   1 /*
   2  * DialogWindow.h
   3  * Copyright 2004 Michael Pfeiffer. All Rights Reserved.
   4  */
   5
   6 #include "DialogWindow.h"
   7
   8 #include <Messenger.h>
   9
  10 DialogWindow::DialogWindow(BRect frame,
  11                         const char *title,
  12                         window_type type,
  13                         uint32 flags,
  14                         uint32 workspace)
  15         : BWindow(frame, title, type, flags, workspace)
  16         , fPreviousResult(B_OK)
  17         , fResult(NULL)
  18 {
  19         // nothing to do
  20 }
  21
  22 DialogWindow::DialogWindow(BRect frame,
  23                         const char *title,
  24                         window_look look,
  25                         window_feel feel,
  26                         uint32 flags,
  27                         uint32 workspace)
  28         : BWindow(frame, title, look, feel, flags, workspace)
  29         , fPreviousResult(B_OK)
  30         , fResult(NULL)
  31 {
  32         // nothing to do
  33 }
  34
  35 void DialogWindow::MessageReceived(BMessage *msg)
  36 {
  37         if (msg->what == kGetThreadId) {
  38                 BMessage reply;
  39                 reply.AddInt32("thread_id", Thread());
  40                 msg->SendReply(&reply);
  41                 return;
  42         }
  43         BWindow::MessageReceived(msg);
  44 }
  45
  46 status_t DialogWindow::Go()
  47 {
  48         BMessenger messenger(this, this);
  49         // store result in local variable and
  50         // initialize it with previous result
  51         volatile status_t result = fPreviousResult;
  52         // new results are stored on the stack
  53         fResult = &result;
  54
  55         // show the window
  56         Show();
  57         // at this point we must not access member variables,
  58         // because this object (the window) could already be deleted.
  59
  60         // get thread id of window thread
  61         BMessage reply;
  62         if (messenger.SendMessage(kGetThreadId, &reply) != B_OK) {
  63                 return B_ERROR;
  64         }
  65         thread_id windowThread;
  66         if (reply.FindInt32("thread_id", &windowThread) != B_OK) {
  67                 return B_ERROR;
  68         }
  69
  70         // wait for window thread to die
  71         // The window thread will crash if the image holding the
  72         // code used by the window thread is unloaded while the thread is
  73         // still running!!!
  74         status_t status = B_ERROR;
  75         wait_for_thread(windowThread, &status);
  76
  77         return result;
  78 }
  79
  80 void DialogWindow::SetResult(status_t result)
  81 {
  82         if (fResult != NULL) {
  83                 *fResult = result;
  84         } else {
  85                 fPreviousResult = result;
  86         }
  87 }
  88