86 lines
2.1 KiB
Dart
86 lines
2.1 KiB
Dart
/* --------------------------------------------- 100 -------------------------------------------- */
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import 'dart:io';
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// void main() {
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// print("please enter your age");
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// String? _age = stdin.readLineSync();
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// int age = int.parse(_age!);
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// int turn100 = 100 - age;
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// print("your age is $turn100");
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// if (age%2 > 0) {
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// print("your age is odd");
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// }
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// else if (age%2 == 0) {
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// print("your age is even");
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// }
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// }
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abstract class Component {
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final String id;
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final double x;
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final double y;
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final String themeColor;
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final bool isVisible;
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// The base constructor sets the foundation
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Component({
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required this.id,
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required this.x,
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required this.y,
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this.themeColor = 'blue', // Default value
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this.isVisible = true, // Default value
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});
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void render();
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}
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class Button extends Component {
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final String label;
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final double width;
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final double height;
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Button({
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// --- Unique to Button ---
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required this.label,
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required this.width,
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required this.height,
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// --- Passed to Component via super. ---
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required super.id,
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required super.x,
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required super.y,
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super.themeColor, // Doesn't require coz if user not define it defaults to parent's 'blue'. But if user provide value, use super to assign provided value to parent class variable.
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super.isVisible, // Doesn't require coz if user not define, it defaults to parent's 'true'
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// "assert" is a "sanity check" that runs before the class is even fully created. It ensures you can't accidentally create an invisible button with a width of -50. If the condition fails, the program crashes (in debug mode) with your custom error message.
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}) : assert(width > 0 && height > 0, 'Dimensions must be positive');
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@override
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void render() {
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print('Rendering Button "$label" at ($x, $y) with color $themeColor');
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}
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}
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void main() {
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final loginBtn = Button(
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label: 'Login',
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width: 200,
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height: 50,
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id: 'btn_001',
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x: 100,
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y: 500,
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themeColor: 'green', // Overriding the default
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);
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loginBtn.render();
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}
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// ------------------------------------------------------------------
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