run-app's #:windows gives the windows a model has. The app opens a window
when it is first in the list, patches its view and title while it stays,
and closes it when it is gone. A click on its close button sends its
on-close message, and the model closes it. A #:modal window is a dialog
over the main window, so a dialog of the program's own is a window whose
state is in the model.
Windows wait for the main window to be shown, because a dialog cannot
belong to a hidden one, and the program ends when the main window closes.
Key shortcuts and commands such as focus reach the other windows too, and
#:screenshot saves a picture of each one beside the main window's.
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A component draws itself with (bjogui draw), a pen over Avalonia's
DrawingContext, and hears the pointer, the wheel, the keys and the focus.
It keeps a state of its own between inputs, and sends outputs that drawn
makes the app's messages. It is drawn again only when its value, its state
or its size changes, and no Avalonia class is subclassed: the picture is a
DrawingImage on a canvas.
start-headless! sets Avalonia up with no screen, drawing with Skia, so
tests/components.bjo draws components and reads their pixels. The mixer
example has knobs and a timeline.
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view-map gives a view's every message to a function first, so a part with a
message type, an update and a view of its own goes in a larger view with
the case of the larger message that carries its own.
canvas is a surface for rect, ellipse, line and path, placed by their own
numbers, and other views by at-point. on-press, on-move and on-release send
the place on the canvas. They come from whatever is drawn on it too, so
they are taken from any source, and a press takes the pointer for the drag.
examples/sketch.bjo draws with it, and docs/sketch.png is its picture.
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A tree node is a TreeViewItem: a header and items, patched by key as a
list's items are. The chosen node is chosen by its key, once the nodes are
there, and a click sends the key. SelectedItem is a direct property, which
a clear does not reset, so no choice is set as null.
The Readme now covers menus and keys, dialogs, styles and themes, and the
new controls. docs/styles.png is examples/styles.bjo.
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run-app takes #:screenshot, a path: the window saves a PNG of itself there
once it is shown and laid out, at twice its size, and closes. It defaults to
the environment variable BJOGUI_SCREENSHOT, so any program can be pictured
with no change. docs/todo.png is examples/todo.bjo, taken that way.
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