-
- As always, we include the header files (conio and curses for getting
- user input from the console), and use the irrlicht namespaces. We also
- store a pointer to the Irrlicht device, a counter variable for changing
- the creation position of a window, and a pointer to a listbox.
-
-
- #include <irrlicht.h>
-#include <iostream>
-using namespace irr;
- using namespace core;
-using namespace scene;
-using namespace video;
-using namespace io;
-using namespace gui;
- #pragma comment(lib, "Irrlicht.lib")
- IrrlichtDevice *device = 0;
-s32 cnt = 0;
-IGUIListBox* listbox = 0;
- |
-
-
- The Event Receiver is not only capable of getting keyboard and mouse
- input events, but also events of the graphical user interface (gui).
- There are events for almost everything: Button click, Listbox selection
- change, events that say that a element was hovered and so on. To be
- able to react to some of these events, we create
- an event receiver. We only react to gui events, and if it's such an
- event, we get the id of the caller (the gui element which caused the
- event) and get the pointer to the gui environment.
-
-
- class MyEventReceiver : public IEventReceiver { public: virtual bool OnEvent(const SEvent& event) { if (event.EventType == EET_GUI_EVENT) { s32 id = event.GUIEvent.Caller->getID(); IGUIEnvironment* env = device->getGUIEnvironment();
- switch(event.GUIEvent.EventType)
- {
- |
-
-
- If a scrollbar changed its scroll position, and it is 'our' scrollbar
- (the one with id 104), then we change the
- transparency of all gui elements. This is a very easy task: There is
- a skin object, in which all color settings are stored. We simply go
- through all colors stored in the skin and change their alpha value.
-
-
-
- case EGET_SCROLL_BAR_CHANGED: if (id == 104) { s32 pos = ((IGUIScrollBar*)event.GUIEvent.Caller)->getPos(); for (s32 i=0; i<EGDC_COUNT ; ++i) { SColor col = env->getSkin()->getColor((EGUI_DEFAULT_COLOR)i); col.setAlpha(pos); env->getSkin()->setColor((EGUI_DEFAULT_COLOR)i, col); } } break; |
-
-
- If a button was clicked, it could be one of 'our' three buttons. If
- it is the first, we shut down the engine.
- If it is the second, we create a little window with some text on it.
- We also add a string to the list box to log
- what happened. And if it is the third button, we create a file open
- dialog, and add also this as string to the list box.
- That's all for the event receiver.
-
-
-
- case EGET_BUTTON_CLICKED:
- if (id == 101)
- {
- device->closeDevice();
- return true;
- }
- if (id == 102)
- {
- listbox->addItem(L"Window created");
- cnt += 30;
- if (cnt > 200)
- cnt = 0;
- IGUIWindow* window = env->addWindow(
- rect<s32>(100 + cnt, 100 + cnt, 300 + cnt, 200 + cnt), false, // modal?
- L"Test window");
- env->addStaticText(L"Please close me",
- rect<s32>(35,35,140,50),
- true, // border?,
- false, // wordwrap?
- window);
-
- return true;
- }
- if (id == 103)
- {
- listbox->addItem(L"File open");
- env->addFileOpenDialog(L"Please choose a file.");
- return true;
- }
- break;
- }
- }
- return false;
- }
- };
- |
-
-
- Ok, now for the more interesting part. First, create the Irrlicht device.
- As in some examples before, we ask the user which driver he wants to
- use for this example:
-
-
-
- int main()
-{
- // ask user for driver
- video::E_DRIVER_TYPE driverType;
-
-
- printf("Please select the driver you want for this example:\n"\ " (a) Direct3D 9.0c\n (b) Direct3D 8.1\n (c) OpenGL 1.5\n"\ " (d) Software Renderer\n (e) Apfelbaum Software Renderer\n"\ " (f) NullDevice\n (otherKey) exit\n\n");
char i; std::cin >> i;
- switch(i) { case 'a': driverType = video::EDT_DIRECT3D9;break; case 'b': driverType = video::EDT_DIRECT3D8;break; case 'c': driverType = video::EDT_OPENGL; break; case 'd': driverType = video::EDT_SOFTWARE; break; case 'e': driverType = video::EDT_BURNINGSVIDEO;break; case 'f': driverType = video::EDT_NULL; break; default: return 1; }
-
- // create device and exit if creation failed
- device = createDevice(driverType, core::dimension2d<s32>(640, 480));
- if (device == 0)
- return 1;
-
- |
-
-
- The creation was successful, now we set the event receiver and store
- pointers to the driver and to the gui environment.
-
-
- MyEventReceiver receiver;
-device->setEventReceiver(&receiver);
-device->setWindowCaption(L"Irrlicht Engine - User Inferface Demo");
- video::IVideoDriver* driver = device->getVideoDriver();
-IGUIEnvironment* env = device->getGUIEnvironment();
-
- |
-
-
- We add three buttons. The first one closes the engine. The second creates
- a window and the third opens a file open dialog. The third parameter is
- the id of the button, with which we can easily identify the button in
- the event receiver.
-
-
- env->addButton(rect<s32>(10,240,100,270), 0, 101, L"Quit"); env->addButton(rect<s32>(10,280,100,320), 0, 102, L"New Window"); env->addButton(rect<s32>(10,330,100,370), 0, 103, L"File Open"); |
-
-
- Now, we add a static text and a scrollbar, which modifies the transparency
- of all gui elements. We set the maximum value of the scrollbar to 255,
- because that's the maximal value for a color value.
- Then we create an other static text and a list box.
-
-
- env->addStaticText(L"Transparent Control:", rect<s32>(150,20,350,40), true); IGUIScrollBar* scrollbar = env->addScrollBar(true,
- rect<s32>(150, 45, 350, 60), 0, 104); scrollbar->setMax(255);
- env->addStaticText(L"Logging ListBox:", rect<s32>(50,110,250,130), true);
-listbox = env->addListBox(rect<s32>(50, 140, 250, 210)); |
-
-
-
- To make the font a little bit nicer, we load an external font and set it
- as new font in the skin. An at last, we create a nice Irrlicht Engine logo
- in the top left corner.
-
-
-
- IGUISkin* skin = env->getSkin(); IGUIFont* font = env->getFont("../../media/fonthaettenschweiler.bmp"); if (font) skin->setFont(font);
- IGUIImage* img = env->addImage( driver->getTexture("../../media/irrlichtlogoalpha.tga"), position2d<int>(10,10)); |
-
-
- That's all, we only have to draw everything.
-
-
-
- while(device->run() && driver) if (device->isWindowActive()) { driver->beginScene(true, true, SColor(0,122,65,171));
- env->drawAll();
- driver->endScene();
- }
-
- device->drop();
- return 0;
-}
- |
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