Open Imperatorn opened 10 months ago
Here is the full code:
import dlangui;
import std;
mixin APP_ENTRY_POINT;
/// entry point for dlangui based application
extern (C) int UIAppMain(string[] args) {
// create window
Window window = Platform.instance.createWindow("DlangUI example - HelloWorld", null);
// frames
auto frame1 = new AppFrame();
auto frame2 = new AppFrame();
/****** FRAME 1 ********/
auto frame1_button1 = new Button(null, "Press me"d);
auto frame1_button2 = new Button(null, "Remove me"d);
auto frame1_button3 = new Button(null, "new window frame"d);
frame1.addChildren([
new HorizontalLayout().addChildren([
new TextWidget(null, "1 text item"d),
new TextWidget(null, "2 text item"d),
new TextWidget(null, "3 text item"d)
]),
new TextWidget(null, "4 text item"d),
new TextWidget(null, "5 text item"d),
new TextWidget(null, "6 text item"d),
frame1_button1,
frame1_button2,
frame1_button3,
]);
frame1_button1.click = delegate(Widget src) {
frame1.addChild(new TextWidget(null, "hello, world! "d ~ frame1.childCount.to!dstring));
return true;
};
frame1_button2.click = delegate(Widget src) {
frame1.removeChild(frame1.childCount-1);
return true;
};
frame1_button3.click = delegate(Widget src) {
window.executeInUiThread(() => window.mainWidget = frame2);
return true;
};
/****** FRAME 2 ********/
auto frame2_button1 = new Button(null, "Take me back"d);
frame2.addChildren([
new TextWidget(null, "4 text item"d),
new TextWidget(null, "5 text item"d),
frame2_button1,
]);
frame2_button1.click = delegate(Widget src) {
window.executeInUiThread(() => window.mainWidget = frame1);
return true;
};
// start with frame 1
window.executeInUiThread(() => window.mainWidget = frame1);
// show window
window.show();
// run message loop
return Platform.instance.enterMessageLoop();
}
Thanks, I'll take a look when I get time!
Here is the full code:
So the reason why this happens is:
@property void mainWidget(Widget widget)
{
mainWidgetChange(this, _mainWidget, widget);
if (_mainWidget !is null)
{
_mainWidget.window = null;
destroy(_mainWidget); // This line
}
_mainWidget = widget;
if (_mainWidget !is null)
_mainWidget.window = this;
}
When you change the widget, the "source" widget gets destroyed, so when you attempt to set it the second time it errors out. I cannot simply remove this behavior as it will break other parts of dlangui. For now, the workaround would be creating the frame from scratch.
From a user in the forums
I know how to change the current AppFrame:
But how do I exit this frame?
I press the button, change to new frame, do the work, and now I want to return to the previous frame. How would I do this?
It crashes if I reset it to the previous one.