Embed CAD Library in JUCE


#1

Hello Everyone,
I have been using wxWidgets for 3 years as my front-end for my CAD Library, but recently came across JUCE and found the interface to be lightweight with custom look and feel. In the future, I am thinking to migrate to JUCE for above mentioned reasons. As a starter, I am trying to embed the CAD library to display its context in JUCE Component, but with partial success. The following code embeds the CAD Viewer in the Component. But when the window is maximised, it behaves differently( Shown in Attachment ).


class GUIPanel  : public Component{
	public:
	//==============================================================================

	GUIPanel::GUIPanel (){
		setSize (600, 400);
	}

	GUIPanel::~GUIPanel(){}

	void GUIPanel::resized() override{
		TFL_GUIController::GetGUIController()->ResizeOCCViewer();
	}

	JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (GUIPanel)
};


//==============================================================================
class SampleJUCEOCCApplication  : public JUCEApplication{
public:
	//==============================================================================
	SampleJUCEOCCApplication() {}

	const String getApplicationName() override       { return ProjectInfo::projectName; }
	const String getApplicationVersion() override    { return ProjectInfo::versionString; }
	bool moreThanOneInstanceAllowed() override       { return true; }

	//==============================================================================
	void initialise (const String& commandLine) override{
		// This method is where you should put your application's initialisation code..

		mainWindow = new MainWindow (getApplicationName());
	}

	void shutdown() override
	{
		// Add your application's shutdown code here..

		mainWindow = nullptr; // (deletes our window)
	}

	//==============================================================================
	void systemRequestedQuit() override
	{
		// This is called when the app is being asked to quit: you can ignore this
		// request and let the app carry on running, or call quit() to allow the app to close.
		quit();
	}

	void anotherInstanceStarted (const String& commandLine) override
	{
		// When another instance of the app is launched while this one is running,
		// this method is invoked, and the commandLine parameter tells you what
		// the other instance's command-line arguments were.
	}

	//==============================================================================
	/*
		This class implements the desktop window that contains an instance of
		our MainContentComponent class.
	*/
	class MainWindow    : public DocumentWindow{
		public:
		MainWindow (String name)  : DocumentWindow (name,
                                                Desktop::getInstance().getDefaultLookAndFeel()
                                                                      .findColour (ResizableWindow::backgroundColourId),
                                                DocumentWindow::allButtons)
		{
			guiPanel = new GUIPanel();
			setUsingNativeTitleBar (true);
			setContentOwned (guiPanel, false);
		
			centreWithSize( 800, 600 );
			setVisible (true);
			TFL_GUIController::GetGUIController()->InitOCCViewer( guiPanel->getWindowHandle() );//This Initializes The CAD functionality To Be Displayed In The WindowHandle
		}

		void closeButtonPressed() override
		{
			// This is called when the user tries to close this window. Here, we'll just
			// ask the app to quit when this happens, but you can change this to do
			// whatever you need.
			JUCEApplication::getInstance()->systemRequestedQuit();
		}

		/* Note: Be careful if you override any DocumentWindow methods - the base
			class uses a lot of them, so by overriding you might break its functionality.
			It's best to do all your work in your content component instead, but if
			you really have to override any DocumentWindow methods, make sure your
			subclass also calls the superclass's method.
		*/

	private:
		GUIPanel* guiPanel;
		JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MainWindow)
	};

private:
	ScopedPointer<MainWindow> mainWindow;
};

//==============================================================================
//This macro generates the main() routine that launches the app.
START_JUCE_APPLICATION (SampleJUCEOCCApplication)

#2

You call your ResizeOCCViewer in resized(), but how does it know what size to make it?


#3

I wonder if guiPanel->getWindowHandle() returns a non-null valid window handle? (Only JUCE top level windows are IIRC real system windows with a handle.)


#4

I wonder if guiPanel->getWindowHandle() returns a non-null valid window handle? (Only JUCE top level windows are IIRC real system windows with a handle.)

Ya thats true, JUCE gives the WindowHandle only for the top level window. Is there an option for making window in window, so that one of the window can be used exclusively for the CAD display context?

You call your ResizeOCCViewer in resized(), but how does it know what size to make it?

Well cpr, the CAD library does it automatically, but another strange thing, I noticed during debug is that, the resized() method of GUIPanel is not overridden!!! Any help on this would be nice :slight_smile:


#5

Can you make your CAD view ActiveX compatible? If yes, you could also use JUCE’s ActiveXControlComponent.

If no, then (as @cpr mentioned) you need to pass the new bounds of your component to the native component by resizing it with native win32 calls. You may need to convert between local and global coordinates depending on your view hierarchy (note: JUCE components are not native win32 windows - only the top-level window is). You should also override parentHierachyChanged callback to track if the top-level peer has changed. If yes, you’ll need to remove your native window from JUCE’s top-level window and add it to the new peer.