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w4d's Issues

Optimize layout.

Layout is too slow, because now it calculates all styles if it's not changed.
So it's necessary just to move widgets using shiftChildren, if parent size is not changed.

And resizing elements is too, add handleResize and handleMove methods to improve.

ToDo

  • Add handleResize/handleMove to Layoutable interface.
  • Implement handleResize/handleMove methods to Widget.
  • Change Layout to just moving, if parent size isn't changed.

Failed to place the too big child. 

w4d.layout.exception.LayoutException@../../.dub/packages/w4d-master/w4d/src/w4d/layout/split.d(19): Failed to place the too big child.
----------------
/usr/include/dlang/dmd/std/exception.d:515 void std.exception.bailOut!(w4d.layout.exception.LayoutException).bailOut(immutable(char)[], ulong, scope const(char)[]) [0xb9727c15]
/usr/include/dlang/dmd/std/exception.d:436 bool std.exception.enforce!(w4d.layout.exception.LayoutException).enforce!(bool).enforce(bool, lazy const(char)[], immutable(char)[], ulong) [0xb971c1e6]
../../.dub/packages/w4d-master/w4d/src/w4d/layout/split.d:19 void w4d.layout.split.SplitLayout!(true).SplitLayout.updateStatus(g4d.math.vector.Vector!(float, 2u).Vector) [0xb970b549]
../../.dub/packages/w4d-master/w4d/src/w4d/layout/lineup.d:47 void w4d.layout.lineup.LineupLayout!(true).LineupLayout.place(g4d.math.vector.Vector!(float, 2u).Vector, g4d.math.vector.Vector!(float, 2u).Vector) [0xb971d0df]
../../.dub/packages/w4d-master/w4d/src/w4d/widget/base/package.d:129 g4d.math.vector.Vector!(float, 2u).Vector w4d.widget.base.Widget.layout(g4d.math.vector.Vector!(float, 2u).Vector, g4d.math.vector.Vector!(float, 2u).Vector) [0xb97108ca]
../../.dub/packages/w4d-master/w4d/src/w4d/widget/base/package.d:122 void w4d.widget.base.Widget.layout(g4d.math.vector.Vector!(int, 2u).Vector) [0xb9710854]
../../.dub/packages/w4d-master/w4d/src/w4d/widget/root.d:35 void w4d.widget.root.RootWidget.layout(g4d.math.vector.Vector!(int, 2u).Vector) [0xb9719474]
../../.dub/packages/w4d-master/w4d/src/w4d/task/window.d:114 bool w4d.task.window.Window.exec(w4d.app.App) [0xb970ef36]
../../.dub/packages/w4d-master/w4d/src/w4d/app.d:45 bool w4d.app.App.exec().__lambda1!(w4d.app.Task).__lambda1(w4d.app.Task) [0xb970a5b1]
/usr/include/dlang/dmd/std/algorithm/mutation.d:2397 w4d.app.Task[] std.algorithm.mutation.removePredStable!(w4d.app.App.exec().__lambda1, w4d.app.Task[]).removePredStable(w4d.app.Task[]) [0xb970a52c]
/usr/include/dlang/dmd/std/algorithm/mutation.d:2250 w4d.app.Task[] std.algorithm.mutation.remove!(w4d.app.App.exec().__lambda1, 2, w4d.app.Task[]).remove(w4d.app.Task[]) [0xb970a4d4]
../../.dub/packages/w4d-master/w4d/src/w4d/app.d:45 int w4d.app.App.exec() [0xb970a3e0]
source/app.d:27 _Dmain [0xb9546e5f]

this issue seems to happen a lot. Also happens in the imgviewer example when resizing around

ScrollPanelWidget not working properly

I have this layout:

VerticalScrollPanelWidget
.contents:
  PanelWidget:VerticalLineupLayout
    PanelWidget:VerticalMonospacesSplitLayout {x10}
      PanelWidget:HorizontalLineupLayout
        TextWidget
        TextWidget
      TextWidget
      TextWidget

the scrollbar doesn't go all the way down if the parent container is not big enough (children are clipped outside). After manually setting the {x10} PanelWidget height to 80px it works for more sizes, but it's still broken.

Am I using the ScrollPanelWidget wrong?

Implement Logger.

Now w4d outputs warnings to console using writeln. But the console sometimes doesn't work properly. For example, Git Bash on Windows.
So it has should support to output to files also.

Disabled, readonly, toggle buttons

Disabled buttons should be grayed out and not clickable
Readonly buttons should just be not clickable
Toggle buttons stay pressed when you click them (much like checkboxes, just rendered as buttons)

GravityLayout issue.

Describe the bug
Widgets placed by GravityLayout may protrudes to outside of client area of the parent.
So the widgets sometimes don't react to mouse action.

deepinscreenshot_select-area_20180820001702
And this layouting is not expected. Removing the spaces of the widgets, or so on is expected.

Allow children on GravityLayout

Centering texts works well with GravityLayout, but I also want to center entire widgets (in my case, a table) to the parent

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