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Jorijn van der Graaf 2025-11-16 15:32:03 +01:00
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# HelloInput Example
## Description
This example demonstrates how to handle basic input events by:
- Create a window using `WindowWaylandWayland`
- Register event listeners using `EventListener<T>` for:
- Mouse click events
- Specific key events
- General keypress events
- Print formatted feedback to the console when events are triggered
## Expected Result
When you interact with the window, you might see console output like:
Clicked on X:450 Y:320!
Pressed specifically the a key!
Pressed the b key!
Make sure that the window has focus.
## Highlighted Code Snippet
```cpp
EventListener<MousePoint> clickListener(&window.onMouseLeftClick, [](MousePoint point){
std::cout << std::format("Clicked on X:{} Y:{}!", point.x, point.y);
});
EventListener<void> keyAListener(&window.onKeyDown['a'], [](){
std::cout << std::format("Pressed specifically the a key!");
});
EventListener<char> anyKeyListener(&window.onAnyKeyDown, [](char key){
std::cout << std::format("Pressed the {} key!", key);
});
```
## How to Run
```bash
crafter-build -c example -r
```
## Relevant documentation
[Window](https://crafter-graphics.docs.catcrafts.net/classCrafter_1_1Window.html)

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/*
Crafter®.Graphics
Copyright (C) 2025 Catcrafts®
Catcrafts.net
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3.0 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <iostream>
#include <format>
import Crafter.Graphics;
//Needed for events
import Crafter.Event;
using namespace Crafter;
int main() {
// Create a Wayland window named "HelloWindow" with resolution 1280x720
// (window creation explained in HelloWindow example)
WindowWaylandWayland window("HelloWindow", 1280, 720);
// Listen for left mouse click events on the window
// The callback receives the MousePoint struct containing the click coordinates in float pixels from the top left corner
EventListener<MousePoint> clickListener(&window.onMouseLeftClick, [](MousePoint point){
// Print the coordinates where the user clicked
std::cout << std::format("Clicked on X:{} Y:{}!", point.x, point.y) << std::endl;
});
// Listen specifically for the 'a' key being pressed down
// The callback takes no parameters since the key is fixed
EventListener<void> keyAListener(&window.onKeyDown['a'], [](){
// Print confirmation of 'a' key press
std::cout << std::format("Pressed specifically the a key!") << std::endl;
});
// Listen for any key press on the window
// The callback receives the character of the key pressed
EventListener<char> anyKeyListener(&window.onAnyKeyDown, [](char key){
// Print which key was pressed
std::cout << std::format("Pressed the {} key!", key) << std::endl;
});
// Start the window event loop, unless the window is started events will not trigger.
window.StartSync();
}

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{
"name": "crafter-graphics",
"configurations": [
{
"name": "example",
"standard": "c++26",
"source_files": ["main"],
"module_files": [],
"build_dir": "build",
"output_dir": "bin",
"type":"executable",
"libs": [],
"flags": ["-Wno-uninitialized"],
"dependencies": [
{
"path":"../../project.json",
"configuration":"lib-debug"
}
]
}
]
}