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Mouse Buttons

The Wails runtime intercepts mouse clicks to determine whether a frameless window needs resizing or a window needs to be moved. It has been asked how to detect when a mouse click has occurred, because window.onclick doesn't report the mouse buttons correctly. The following code shows how to detect mouse clicks:

window.addEventListener('mousedown', handleMouseButtonDown);

function handleMouseButtonDown(event) {
if (event.button === 0) {
// left mouse button
} else if (event.button === 1) {
// middle mouse button
} else if (event.button === 2) {
// right mouse button
} else if (event.button === 3) {
// back mouse button
} else if (event.button === 4) {
// forward mouse button
} else {
// other mouse button
}
}

Reference: https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/button