Example C# calculator app
For simplicity, only integer operations and no direct editing of the numbers. This is meant as a simple UI example, not as a CS exercise.
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Xavi Artigas
parent
8caeaaf071
commit
f9486b6bfd
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project(
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'efl-example-calculator', 'cs',
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version : '0.0.1',
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meson_version : '>= 0.38.0')
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efl_mono = dependency('efl-mono', version : '>=1.20.99')
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efl_mono_libs = efl_mono.get_pkgconfig_variable('mono_libs')
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subdir('src')
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using System;
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public class Calculator : Efl.Csharp.Application
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{
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private Efl.Ui.Text screen;
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private int prevValue = 0;
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private int currValue = 0;
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private char operation = '=';
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private bool mustOverwrite = false;
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// Quits the application
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private void GUIQuitCb(object sender, Efl.Gfx.EntityVisibilityChangedEventArgs ea)
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{
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if (ea.arg == false)
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Efl.App.AppMain.Quit(0);
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}
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private void Operate()
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{
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switch (operation)
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{
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case '+':
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currValue += prevValue;
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break;
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case '-':
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currValue = prevValue - currValue;
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break;
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case '*':
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currValue *= prevValue;
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break;
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case '/':
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currValue = prevValue / currValue;
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break;
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default:
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break;
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}
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}
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private void ButtonPressedCb(char button)
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{
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if (button >= '0' && button <= '9')
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{
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if (mustOverwrite)
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{
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screen.SetText("");
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mustOverwrite = false;
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}
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screen.SetText(screen.GetText() + button.ToString());
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}
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else
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{
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switch (button)
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{
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case 'C':
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screen.SetText("0");
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break;
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case '+':
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case '-':
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case '*':
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case '/':
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case '=':
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if (operation != '=')
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{
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Operate();
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screen.SetText(currValue.ToString());
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}
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operation = button;
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mustOverwrite = true;
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prevValue = currValue;
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break;
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default:
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break;
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}
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}
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}
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private void ScreenChangedCb(object sender, EventArgs ea)
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{
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string text = "";
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string str = screen.GetText();
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int d;
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if (str == "" || str == "-")
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{
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text = "0";
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}
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else
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{
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try
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{
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d = Convert.ToInt32(str);
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text = d.ToString();
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currValue = d;
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}
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catch {}
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}
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if (text != str) screen.SetText(text);
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}
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// text is what is drawn on the button, which might be a multi-byte unicode string.
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// command is a single-char id for the button.
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private void AddButton(Efl.Ui.Table table, string text, char command, int posx, int posy, int r, int g, int b)
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{
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var button = new Efl.Ui.Button(table);
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table.PackTable(button, posx, posy, 1, 1);
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button.ClickedEvent += (object sender, Efl.Input.ClickableClickedEventArgs ea) => {
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ButtonPressedCb(command);
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};
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// Buttons can only have simple text (no font, styles or markup) but can swallow
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// any other object we want.
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// Therefore we create a more complex Efl_Ui_Text object and use it as content for the button.
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var label = new Efl.Ui.Text(table);
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label.Editable = false;
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label.Halign = 0.5;
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label.Valign = 0.5;
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label.Color = (r, g, b, 255);
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label.SetText(text);
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label.Font = ("Sans", (Efl.Font.Size)36);
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button.Content = label;
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}
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protected override void OnInitialize(string[] args)
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{
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var win = new Efl.Ui.Win(Efl.App.AppMain);
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win.SetText("EFL Calculator");
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win.Autohide = true;
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win.VisibilityChangedEvent += GUIQuitCb;
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var table = new Efl.Ui.Table(win);
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win.Content = table;
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table.TableSize = (4, 5);
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table.HintSizeMin = new Eina.Size2D(300, 400);
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AddButton(table, "1", '1', 0, 3, 255, 255, 255);
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AddButton(table, "2", '2', 1, 3, 255, 255, 255);
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AddButton(table, "3", '3', 2, 3, 255, 255, 255);
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AddButton(table, "4", '4', 0, 2, 255, 255, 255);
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AddButton(table, "5", '5', 1, 2, 255, 255, 255);
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AddButton(table, "6", '6', 2, 2, 255, 255, 255);
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AddButton(table, "7", '7', 0, 1, 255, 255, 255);
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AddButton(table, "8", '8', 1, 1, 255, 255, 255);
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AddButton(table, "9", '9', 2, 1, 255, 255, 255);
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AddButton(table, "0", '0', 1, 4, 255, 255, 255);
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AddButton(table, "+", '+', 3, 1, 128, 128, 128);
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AddButton(table, "−", '-', 3, 2, 128, 128, 128);
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AddButton(table, "×", '*', 3, 3, 128, 128, 128);
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AddButton(table, "÷", '/', 3, 4, 128, 128, 128);
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AddButton(table, "=", '=', 2, 4, 128, 128, 128);
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AddButton(table, "C", 'C', 0, 4, 0, 0, 0);
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screen = new Efl.Ui.Text(table);
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screen.SetText("0");
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screen.Font = ("Sans", (Efl.Font.Size)48);
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screen.Multiline = false;
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screen.Editable = false;
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screen.SelectionAllowed = false;
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table.PackTable(screen, 0, 0, 4, 1);
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screen.Halign = 0.9;
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screen.Valign = 0.5;
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screen.EffectType = Efl.TextStyleEffectType.Glow;
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screen.GlowColor = (128, 128, 128, 128);
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screen.ChangedEvent += ScreenChangedCb;
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}
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}
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public class Example
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{
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#if WIN32
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[STAThreadAttribute()]
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#endif
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public static void Main()
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{
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var calculator = new Calculator();
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calculator.Launch();
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}
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}
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@ -0,0 +1,12 @@
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src = files([
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'calculator.cs',
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])
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deps = [efl_mono]
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executable('efl_example_calculator', src,
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dependencies : deps,
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cs_args : efl_mono_libs,
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install : true
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)
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