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// @flow
import electron, { screen } from 'electron';
import type { BrowserWindow, Tray, Display } from 'electron';
export default class WindowController {
_window: BrowserWindow;
_tray: Tray;
_isWindowReady = false;
get window(): BrowserWindow {
return this._window;
}
constructor(window: BrowserWindow, tray: Tray) {
this._window = window;
this._tray = tray;
this._installDisplayMetricsHandler();
this._installWindowReadyHandlers();
}
show(whenReady: boolean = true) {
if (whenReady) {
this._executeWhenWindowIsReady(() => this._showImmediately());
} else {
this._showImmediately();
}
}
hide() {
this._window.hide();
}
toggle() {
if (this._window.isVisible()) {
this.hide();
} else {
this.show();
}
}
_showImmediately() {
const window = this._window;
this._updatePosition();
window.show();
window.focus();
}
_updatePosition() {
const { x, y } = this._getWindowPosition();
this._window.setPosition(x, y, false);
}
_getTrayPlacement() {
switch (process.platform) {
case 'darwin':
// macOS has menubar always placed at the top
return 'top';
case 'win32': {
// taskbar occupies some part of the screen excluded from work area
const primaryDisplay = electron.screen.getPrimaryDisplay();
const displaySize = primaryDisplay.size;
const workArea = primaryDisplay.workArea;
if (workArea.width < displaySize.width) {
return workArea.x > 0 ? 'left' : 'right';
} else if (workArea.height < displaySize.height) {
return workArea.y > 0 ? 'top' : 'bottom';
} else {
return 'none';
}
}
default:
return 'none';
}
}
_getWindowPosition(): { x: number, y: number } {
const windowBounds = this._window.getBounds();
const trayBounds = this._tray.getBounds();
const primaryDisplay = electron.screen.getPrimaryDisplay();
const workArea = primaryDisplay.workArea;
const placement = this._getTrayPlacement();
const maxX = workArea.x + workArea.width - windowBounds.width;
const maxY = workArea.y + workArea.height - windowBounds.height;
let x = 0,
y = 0;
switch (placement) {
case 'top':
x = trayBounds.x + (trayBounds.width - windowBounds.width) * 0.5;
y = workArea.y;
break;
case 'bottom':
x = trayBounds.x + (trayBounds.width - windowBounds.width) * 0.5;
y = workArea.y + workArea.height - windowBounds.height;
break;
case 'left':
x = workArea.x;
y = trayBounds.y + (trayBounds.height - windowBounds.height) * 0.5;
break;
case 'right':
x = workArea.width - windowBounds.width;
y = trayBounds.y + (trayBounds.height - windowBounds.height) * 0.5;
break;
case 'none':
x = workArea.x + (workArea.width - windowBounds.width) * 0.5;
y = workArea.y + (workArea.height - windowBounds.height) * 0.5;
break;
}
x = Math.min(Math.max(x, workArea.x), maxX);
y = Math.min(Math.max(y, workArea.y), maxY);
return {
x: Math.round(x),
y: Math.round(y),
};
}
// Installs display event handlers to update the window position on any changes in the display or workarea dimensions.
_installDisplayMetricsHandler() {
screen.addListener('display-metrics-changed', this._onDisplayMetricsChanged);
this._window.once('closed', () => {
screen.removeListener('display-metrics-changed', this._onDisplayMetricsChanged);
});
}
_onDisplayMetricsChanged = (_event: any, _display: Display, changedMetrics: Array<string>) => {
if (changedMetrics.includes('workArea') && this._window.isVisible()) {
this._updatePosition();
}
};
_installWindowReadyHandlers() {
this._window.once('ready-to-show', () => {
this._isWindowReady = true;
});
}
_executeWhenWindowIsReady(closure: () => any) {
if (this._isWindowReady) {
closure();
} else {
this._window.once('ready-to-show', () => {
closure();
});
}
}
}
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