Address issues #10, #11, and #12 and add extra utility features

[Adrian-Samoticha]

This pull request addresses issues #10, #11, and #12 while also providing the following extra utility features:

Get the height of the titlebar when the full-size content view is enabled.

final titlebarHeight = Window.getTitlebarHeight();

Set the document to be edited.

Window.setDocumentEdited();

Set the document to be unedited.

Window.setDocumentUnedited();

Set the represented file of the window.

Window.setRepresentedFilename('path/to/file.txt');

Set the represented URL of the window.

Window.setRepresentedUrl('https://flutter.dev');

Hide the titlebar of the window.

Window.hideTitle();

Show the titlebar of the window.

Window.showTitle();

Make the window's titlebar transparent.

Window.makeTitlebarTransparent();

Make the window's titlebar opaque.

Window.makeTitlebarOpaque();

Enable the window's full-size content view. It is recommended to enable the full-size content view when making the titlebar transparent.

Window.enableFullSizeContentView();

Disable the window's full-size content view.

Window.disableFullSizeContentView();

Zoom the window.

Window.zoomWindow();

Unzoom the window.

Window.unzoomWindow();

Get if the window is zoomed.

final isWindowZoomed = Window.isWindowZoomed();

Get if the window is fullscreened.

final isWindowFullscreened = Window.isWindowFullscreened();

Hide/Show the window's zoom button.

Window.hideZoomButton();
Window.showZoomButton();

Hide/Show the window's miniaturize button.

Window.hideMiniaturizeButton();
Window.showMiniaturizeButton();

Hides/Show the window's close button.

Window.hideCloseButton();
Window.showCloseButton();

Enable/Disable the window's zoom button.

Window.enableZoomButton();
Window.disableZoomButton();

Enable/Disable the window's miniaturize button.

Window.enableMiniaturizeButton();
Window.disableMiniaturizeButton();

Enable/Disable the window's close button.

Window.enableCloseButton();
Window.disableCloseButton();

Get whether the window is currently being resized by the user.

final isWindowInLiveResize = Window.isWindowInLiveResize();

Set the window's alpha value.

Window.setWindowAlphaValue(0.75);

Get if the window is visible.

final isWindowVisible = Window.isWindowVisible();

Set the window's titlebar to the default (opaque) color.

Window.setWindowBackgroundColorToDefaultColor()

Make the window's titlebar clear.

Window.setWindowBackgroundColorToClear()

Set the window's blur view state. (This resolves #12.)

Window.setBlurViewState(MacOSBlurViewState.active);
Window.setBlurViewState(MacOSBlurViewState.inactive);
Window.setBlurViewState(MacOSBlurViewState.followsWindowActiveState);

• Resolves #10
• Fixes #11
• Resolves #12