C++ PreviewView类代码示例

void
ModulesView::_CloseSaver()
{
	// remove old screen saver preview & config

	BScreenSaver* saver = _ScreenSaver();
	BView* view = fPreviewView->RemovePreview();
	if (fSettingsView != NULL)
		fSettingsBox->RemoveChild(fSettingsView);

	if (fSaverRunner != NULL)
		fSaverRunner->Quit();

	if (saver != NULL)
		saver->StopConfig();

	delete view;
	delete fSettingsView;
	delete fSaverRunner;
		// the saver runner also unloads the add-on, so it must
		// be deleted last

	fSettingsView = NULL;
	fSaverRunner = NULL;
}

void
ModulesView::_OpenSaver()
{
	// create new screen saver preview & config

	BView* view = fPreviewView->AddPreview();
	fCurrentName = fSettings.ModuleName();
	fSaverRunner = new ScreenSaverRunner(Window(), view, true, fSettings);
	BScreenSaver* saver = _ScreenSaver();

#ifdef __HAIKU__
	BRect rect = fSettingsBox->InnerFrame().InsetByCopy(4, 4);
#else
	BRect rect = fSettingsBox->Bounds().InsetByCopy(4, 4);
	rect.top += 14;
#endif
	fSettingsView = new BView(rect, "SettingsView", B_FOLLOW_ALL, B_WILL_DRAW);

	fSettingsView->SetViewColor(ui_color(B_PANEL_BACKGROUND_COLOR));
	fSettingsBox->AddChild(fSettingsView);

	if (saver != NULL && fSaverRunner->Run() == B_OK)
		saver->StartConfig(fSettingsView);

	if (fSettingsView->ChildAt(0) == NULL) {
		// There are no settings at all, we add the module name here to
		// let it look a bit better at least.
		BPrivate::BuildScreenSaverDefaultSettingsView(fSettingsView,
			fSettings.ModuleName()[0] ? fSettings.ModuleName()
				: B_TRANSLATE("Blackness"),
				saver != NULL || !fSettings.ModuleName()[0]
					? B_TRANSLATE("No options available")
					: B_TRANSLATE("Could not load screen saver"));
	}
}

void
ModulesView::_OpenSaver()
{
	// create new screen saver preview & config

	BView* view = fPreviewView->AddPreview();
	fCurrentName = fSettings.ModuleName();
	fSaverRunner = new ScreenSaverRunner(view->Window(), view, fSettings);

#ifdef __HAIKU__
	BRect rect = fSettingsBox->InnerFrame().InsetByCopy(4, 4);
#else
	BRect rect = fSettingsBox->Bounds().InsetByCopy(4, 4);
	rect.top += 14;
#endif
	fSettingsView = new BView(rect, "SettingsView", B_FOLLOW_ALL, B_WILL_DRAW);

	fSettingsView->SetViewUIColor(B_PANEL_BACKGROUND_COLOR);
	fSettingsBox->AddChild(fSettingsView);

	BScreenSaver* saver = ScreenSaver();
	if (saver != NULL && fSettingsView != NULL) {
		saver->StartConfig(fSettingsView);
		if (saver->StartSaver(view, true) == B_OK) {
			fPreviewView->HideNoPreview();
			fSaverRunner->Run();
		} else
			fPreviewView->ShowNoPreview();
	} else {
		// Failed to load OR this is the "Blackness" screensaver. Show a black
		// preview (this is what will happen in both cases when screen_blanker
		// runs).
		fPreviewView->HideNoPreview();
	}

	if (fSettingsView->ChildAt(0) == NULL) {
		// There are no settings at all, we add the module name here to
		// let it look a bit better at least.
		BPrivate::BuildDefaultSettingsView(fSettingsView,
			fSettings.ModuleName()[0] ? fSettings.ModuleName()
				: B_TRANSLATE("Blackness"),
				saver != NULL || !fSettings.ModuleName()[0]
					? B_TRANSLATE("No options available")
					: B_TRANSLATE("Could not load screen saver"));
	}
}

	virtual void TextChangedCallback(ui::Textbox * sender) {
		v->commentBoxAutoHeight();
	}

	virtual void ActionCallback(ui::Button * sender)
	{
		v->submitComment();
	}

	void updatePreview()
	{
		preview->update();
	}