How To: Detect which monitor a window is located within

Overview

This article provides code examples of how to detect the monitor a window is located in.

Solution 1

The code below gets the bounds of the current window then checks which monitor matches the top-left corner coordinates of the window.

function isInMonitor(winBounds, monitorData) {
    return winBounds.left >= monitorData.monitorRect.left 
        && winBounds.left <=monitorData.monitorRect.right
        && winBounds.top >= monitorData.monitorRect.top 
        && winBounds.top <= monitorData.monitorRect.bottom;
}

fin.desktop.Window.getCurrent().getBounds(winBounds => {
    fin.desktop.System.getMonitorInfo(data=>{
        if (isInMonitor(winBounds, data.primaryMonitor)) {
            console.log("window is in primary monitor, monitor name: " + data.primaryMonitor.name);
        }
        else {
            data.nonPrimaryMonitors.forEach(monitorData => {
                if (isInMonitor(winBounds, monitorData)) {
                    console.log("window is in non-primary monitor, monitor name: " + monitorData.name);
                }
            });
        }
    })
});