Crafter.CppDOM/README.md

# About

![alt text](https://github.com/Catcrafts/Crafter.Web/blob/master/hello.png?raw=true)

Crafter.CppDOM is a C++ library that exposes the browser DOM api's to C++ WebAssembly.

# How to use
Please view the examples folder, this is a snippit from the HelloElement example:

```cpp
import Crafter.CppDOM;
using namespace Crafter::CppDOM;

int main(){
    HtmlElement body("body");
    body.SetInnerHTML("Hello World!");
}
```
You can also view the wiki for more detailed information.

It is highly recommended to use this with [Crafter.Build](https://forgejo.catcrafts.net/Catcrafts/Crafter.Build), but it is not strictly required if the same way of injecting the env is followed. The following instructions will be for Crafter.Build.

## Quickstart
create a ``project.json`` in an empty folder, open it in your preferred text editor.
Create a basic project file, that describes your web project.
```JSON
{
    "name": "main",
    "configurations": [
        {
            "name": "executable",
            "implementations": ["main"],
            "target": "wasm32-wasi",
            "debug" : true,
            "dependencies": [
                {
                    "path":"https://forgejo.catcrafts.net/Catcrafts/Crafter.CppDOM.git",
                    "configuration":"lib-debug"
                }
            ],
        }
    ]
}
```

Save and close the file, create a ``main.cpp``
```cpp
import Crafter.CppDOM;
using namespace Crafter::CppDOM;

int main(){
    HtmlElement body("body");
    body.SetInnerHTML("Hello World!");
}
```

Save and close, then run ``crafter-build build executable && caddy file-server --listen :8080 --root bin/executable``. if you have caddy installed, if not use your favorite static file server instead. Now you can open the browser at ``http://localhost:8080`` and ``Hello World!`` will appear in the browser.

This sample can also be viewed in the [HelloElement example](https://forgejo.catcrafts.net/Catcrafts/Crafter.CppDOM/src/branch/master/examples)

## Enhanced Event Handling Capabilities

The library now supports comprehensive event handling with rich event data for modern web applications:

### Mouse Events
- `AddClickListener()` - Handles click events
- `AddMouseOverListener()` - Handles mouse over events
- `AddMouseOutListener()` - Handles mouse out events
- `AddMouseMoveListener()` - Handles mouse move events
- `AddMouseDownListener()` - Handles mouse down events
- `AddMouseUpListener()` - Handles mouse up events

### Focus Events
- `AddFocusListener()` - Handles focus events
- `AddBlurListener()` - Handles blur events

### Keyboard Events
- `AddKeyDownListener()` - Handles key down events with event data
- `AddKeyUpListener()` - Handles key up events with event data
- `AddKeyPressListener()` - Handles key press events with event data

### Form Events
- `AddChangeListener()` - Handles change events with event data
- `AddSubmitListener()` - Handles form submit events
- `AddInputListener()` - Handles input events with event data

### Window Events
- `AddLoadListener()` - Handles page load events
- `AddErrorListener()` - Handles error events with event data
- `AddResizeListener()` - Handles window resize events with event data
- `AddScrollListener()` - Handles scroll events with event data

### Context Menu Events
- `AddContextMenuListener()` - Handles context menu events with event data

### Drag and Drop Events
- `AddDragStartListener()` - Handles drag start events with event data
- `AddDragEndListener()` - Handles drag end events with event data
- `AddDropListener()` - Handles drop events with event data
- `AddDragOverListener()` - Handles drag over events with event data
- `AddDragEnterListener()` - Handles drag enter events with event data
- `AddDragLeaveListener()` - Handles drag leave events with event data

### Wheel Events
- `AddWheelListener()` - Handles wheel events with event data

### Example Usage with Event Data

```cpp
import Crafter.CppDOM;
using namespace Crafter;

int main(){
    HtmlElement button("myButton");
    HtmlElement input("textInput");
    
    // Handle click event with position data
    button.AddClickListener([]() {
        // Simple click handler without event data
    });
    
    // Handle keyboard events with rich event data
    input.AddKeyDownListener([](Crafter::CppDOM::EventTypes::KeyboardEvent event) {
        // Access key information
        if (event.key == "Enter") {
            // Handle Enter key specifically
        }
        // Check modifier keys
        if (event.ctrlKey) {
            // Handle Ctrl+key combinations
        }
    });
    
    // Handle input changes with event data
    input.AddInputListener([](Crafter::CppDOM::EventTypes::InputEvent event) {
        // Access input data
        std::string data = event.data;
        bool isComposing = event.isComposing;
    });
    
    // Handle mouse movements with coordinates
    button.AddMouseMoveListener([](Crafter::CppDOM::EventTypes::MouseEvent event) {
        // Access mouse position
        double x = event.clientX;
        double y = event.clientY;
    });
    
    // Handle form changes with value
    input.AddChangeListener([](Crafter::CppDOM::EventTypes::ChangeEvent event) {
        // Access the new value
        std::string value = event.value;
    });
    
    // Handle window resize with dimensions
    button.AddResizeListener([](Crafter::CppDOM::EventTypes::ResizeEvent event) {
        // Access window dimensions
        unsigned int width = event.width;
        unsigned int height = event.height;
    });
}
```

### Event Data Structures

The library provides specific event data structures for different event types:

#### KeyboardEvent
- `std::string key` - The key value
- `std::string code` - The physical key code
- `int keyCode` - Legacy key code
- `bool altKey` - Whether Alt key was pressed
- `bool ctrlKey` - Whether Ctrl key was pressed
- `bool shiftKey` - Whether Shift key was pressed
- `bool metaKey` - Whether Meta key was pressed

#### MouseEvent
- `double clientX` - X coordinate relative to viewport
- `double clientY` - Y coordinate relative to viewport
- `double screenX` - X coordinate relative to screen
- `double screenY` - Y coordinate relative to screen
- `int button` - Which mouse button was pressed
- `int buttons` - Which mouse buttons were pressed
- `bool altKey` - Whether Alt key was pressed
- `bool ctrlKey` - Whether Ctrl key was pressed
- `bool shiftKey` - Whether Shift key was pressed
- `bool metaKey` - Whether Meta key was pressed

#### InputEvent
- `std::string data` - The input data
- `bool isComposing` - Whether input is in composition mode

#### ChangeEvent
- `std::string value` - The new value

#### ResizeEvent
- `unsigned int width` - Window width
- `unsigned int height` - Window height

#### ScrollEvent
- `double scrollX` - Horizontal scroll position
- `double scrollY` - Vertical scroll position

#### ErrorEvent
- `std::string message` - Error message
- `std::string filename` - File where error occurred
- `unsigned int lineno` - Line number
- `unsigned int colno` - Column number

#### DragEvent
- All MouseEvent properties plus:
- `double offsetX` - X offset from drag start
- `double offsetY` - Y offset from drag start

#### WheelEvent
- All MouseEvent properties plus:
- `double deltaX` - Horizontal scroll amount
- `double deltaY` - Vertical scroll amount
- `double deltaZ` - Depth scroll amount
- `int deltaMode` - Scroll mode