OpenSceneGraph/examples/osgwidgetscrolled/osgwidgetscrolled.cpp

// -*-c++-*- osgWidget - Code by: Jeremy Moles (cubicool) 2007-2008
// $Id: osgwidgetframe.cpp 34 2008-04-07 03:12:41Z cubicool $

#include <osgWidget/Util>
#include <osgWidget/WindowManager>
#include <osgWidget/Frame>
#include <osgWidget/Box>

const unsigned int MASK_2D = 0xF0000000;

// NOTE: THIS IS JUST A TEMPORARY HACK! :) This functionality will all eventually be
// encapsulate into another class in osgWidget proper.
bool scrollWindow(osgWidget::Event& ev) {
	// The first thing we need to do is make sure we have a Frame object...
	osgWidget::Frame* frame = dynamic_cast<osgWidget::Frame*>(ev.getWindow());

	if(!frame) return false;

	// And now we need to make sure our Frame has a valid internal EmbeddedWindow widget.
	osgWidget::Window::EmbeddedWindow* ew =
		dynamic_cast<osgWidget::Window::EmbeddedWindow*>(frame->getEmbeddedWindow())
	;
		
	if(!ew) return false;
	
	// Lets get the visible area so that we can use it to make sure our scrolling action
	// is necessary in the first place.
	const osgWidget::Quad& va = ew->getWindow()->getVisibleArea();

	// The user wants to scroll up; make sure that the visible area's Y origin isn't already
	// at 0.0f, 0.0f.
	if(ev.getWindowManager()->isMouseScrollingUp() && va[1] != 0.0f)
		ew->getWindow()->addVisibleArea(0, -20)
	;
	
	else if(va[1] <= (ew->getWindow()->getHeight() - ew->getHeight()))
		ew->getWindow()->addVisibleArea(0, 20)
	;

	// We need to manually call update to make sure the visible area scissoring is done
	// properly.
	frame->update();

	return true;
}

bool changeTheme(osgWidget::Event& ev) {
	std::string theme;

	if(ev.key == osgGA::GUIEventAdapter::KEY_Right)
		theme = "osgWidget/theme-1.png"
	;

	else if(ev.key == osgGA::GUIEventAdapter::KEY_Left)
		theme = "osgWidget/theme-2.png"
	;

	else return false;

	osgWidget::Frame* frame = dynamic_cast<osgWidget::Frame*>(ev.getWindow());

	if(!frame) return false;

	// This is just one way to access all our Widgets; we could just as well have used:
	//
	// for(osgWidget::Frame::Iterator i = frame.begin(); i != frame.end() i++) {}
	//
	// ...and it have worked, too.
	for(unsigned int row = 0; row < 3; row++) {
		for(unsigned int col = 0; col < 3; col++) {
			frame->getByRowCol(row, col)->setImage(theme);
		}
	}

	return true;
}

int main(int argc, char** argv) {
	osgViewer::Viewer viewer;

	osgWidget::WindowManager* wm = new osgWidget::WindowManager(
		&viewer,
		1280.0f,
		1024.0f,
		MASK_2D,
		osgWidget::WindowManager::WM_PICK_DEBUG
	);
	
	osgWidget::Frame* frame = osgWidget::Frame::createSimpleFrameWithSingleTexture(
		"frame",
		"../examples/osgwidgetscrolled/theme-2.png",
		64.0f,
		64.0f,
		16.0f,
		16.0f,
		100.0f,
		100.0f
	);

	frame->getBackground()->setColor(0.0f, 0.0f, 0.0f, 0.0f);

	// This is our Transformers box. :)
	osgWidget::Box*    box  = new osgWidget::Box("images", osgWidget::Box::VERTICAL);
	osgWidget::Widget* img1 = new osgWidget::Widget("im1", 256.0f, 256.0f);
	osgWidget::Widget* img2 = new osgWidget::Widget("im2", 256.0f, 256.0f);
	osgWidget::Widget* img3 = new osgWidget::Widget("im3", 256.0f, 256.0f);
	osgWidget::Widget* img4 = new osgWidget::Widget("im4", 256.0f, 256.0f);

	img1->setImage("../examples/osgwidgetscrolled/images/starscream.jpg", true);
	img2->setImage("../examples/osgwidgetscrolled/images/optimus.jpg", true);
	img3->setImage("../examples/osgwidgetscrolled/images/megatron.jpg", true);
	img4->setImage("../examples/osgwidgetscrolled/images/bumblebee.jpg", true);

	img1->setMinimumSize(10.0f, 10.0f);
	img2->setMinimumSize(10.0f, 10.0f);
	img3->setMinimumSize(10.0f, 10.0f);
	img4->setMinimumSize(10.0f, 10.0f);

	box->addWidget(img1);
	box->addWidget(img2);
	box->addWidget(img3);
	box->addWidget(img4);
	box->setEventMask(osgWidget::EVENT_NONE);

	frame->getEmbeddedWindow()->setWindow(box);
	frame->getEmbeddedWindow()->setColor(1.0f, 1.0f, 1.0f, 1.0f);
	frame->resize(300.0f, 300.0f);
	frame->addCallback(osgWidget::Callback(&scrollWindow, osgWidget::EVENT_MOUSE_SCROLL));
	frame->addCallback(osgWidget::Callback(&changeTheme, osgWidget::EVENT_KEY_DOWN));

	wm->addChild(frame);

	return osgWidget::createExample(viewer, wm);
}