Label animation inside a switch case c# -
on face of it seems quite simple. have switch case , if condition met print text label animation. in case type writer animation.
i have made animation cant seem integrate similar version switch case itself. help?
type writer animation code c#:
public partial class form1 : form { int _charindex = 0; string _text = "this test."; public form1() { initializecomponent(); } private void form1_load(object sender, eventargs e) { _charindex = 0; label1.text = string.empty; thread t = new thread(new threadstart(this.typewritetext)); t.start(); } private void typewritetext() { while (_charindex < _text.length) { thread.sleep(50); label1.invoke(new action(() => { label1.text += _text[_charindex]; })); _charindex++; } } } }
and animation code needs placed this:
switch case code:
void testengine(object sender, speechrecognizedeventargs e) { switch (e.result.text) { case "test": //label animation code goes here break; thanks in advance!
short answer - move code in method , call anywhere want.
long answer
while works, doesn't make sense because worker thread sleeping , calling ui thread. system.windows.forms.timer based approach appropriate concrete case. "modern" approach based on async/await. if need flexibility, last 1 best choice. whatever choose, you'll hit reentrancy problem @ point , need handle it. best prepare helper utility class , use anywhere. here example:
using system; using system.drawing; using system.threading; using system.threading.tasks; using system.windows.forms; namespace tests { static class program { [stathread] static void main() { application.enablevisualstyles(); application.setcompatibletextrenderingdefault(false); application.run(new testform()); } class testform : form { public testform() { var label = new label { parent = this, autosize = true, top = 8, left = 8 }; animatehelper = new animatehelper(label); int left = 8; foreach (var action in (buttonaction[])enum.getvalues(typeof(buttonaction))) { var button = new button { parent = this, autosize = true, text = action.tostring(), left = left }; button.top = displayrectangle.bottom - button.height - 8; button.click += (sender, e) => execute(action); left += button.width + 8; } } protected override void dispose(bool disposing) { if (disposing && animatehelper != null) animatehelper.cancel(); base.dispose(disposing); } enum buttonaction { typewritetext, repeattext, cancel } private void execute(buttonaction action) { // original question switch (action) { case buttonaction.typewritetext: typewritetext("this typewriter text animantion test."); break; case buttonaction.repeattext: repeattext("this repeating text animantion test."); break; case buttonaction.cancel: animatehelper.cancel(); break; } } animatehelper animatehelper; void typewritetext(string text) { animatehelper.execute(async (output, ct) => { bool clear = true; try { if (string.isnullorempty(text)) return; output.forecolor = color.blue; (int length = 1; ; length++) { if (ct.iscancellationrequested) return; output.text = text.substring(0, length); if (length == text.length) break; await task.delay(50, ct); } clear = false; } { if (clear) output.text = string.empty; } }); } void repeattext(string text) { animatehelper.execute(async (output, ct) => { try { if (string.isnullorempty(text)) return; output.forecolor = color.red; while (true) { (int length = 1; length <= text.length; length++) { if (ct.iscancellationrequested) return; output.text = text.substring(text.length - length); await task.delay(50, ct); } (int pad = 1; pad < text.length; pad++) { if (ct.iscancellationrequested) return; output.text = new string(' ', pad) + text.substring(0, text.length - pad); await task.delay(50, ct); } if (ct.iscancellationrequested) return; output.text = string.empty; await task.delay(250, ct); } } { output.text = string.empty; } }); } } class animatehelper { label output; task task; cancellationtokensource cts; public animatehelper(label output) { this.output = output; } void reset() { if (cts != null) { cts.dispose(); cts = null; } task = null; } public void cancel() { dontcare(cancelasync()); } async task cancelasync() { if (task != null && !task.iscompleted) { try { cts.cancel(); } catch { } try { await task; } catch { } } reset(); } public void execute(func<label, cancellationtoken, task> action) { dontcare(executeasync(action)); } async task executeasync(func<label, cancellationtoken, task> action) { await cancelasync(); cts = new cancellationtokensource(); task = action(output, cts.token); try { await task; } catch { } reset(); } // make compiler happy static void dontcare(task t) { } } } }
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