win32_gui 1.0.4

Win32 API GUI in Object-Oriented style with some helpers. Uses package `win32` and `dart:ffi`.

example/win32_gui_example.dart

import 'dart:io';

import 'package:win32_gui/win32_gui.dart';
import 'package:win32_gui/win32_gui_logging.dart';

Future<void> main() async {
  logToConsole();

  var editColors = WindowClassColors(
    textColor: RGB(0, 0, 0),
    bgColor: RGB(128, 128, 128),
  );

  WindowClass.editColors = editColors;
  WindowClass.staticColors = editColors;

  var mainWindow = MainWindow(
    width: 640,
    height: 480,
  );

  print('-- mainWindow.ensureLoaded...');
  await mainWindow.ensureLoaded();

  print('-- mainWindow.show...');
  mainWindow.show();

  mainWindow.onClose.listen((window) {
    print('-- Main Window closed> $window');
    mainWindow.destroy();
  });

  mainWindow.onDestroyed.listen((window) {
    print('-- Main Window Destroyed> $window');
    exit(0);
  });

  print('-- Window.runMessageLoopAsync...');
  await Window.runMessageLoopAsync();
}

class MainWindow extends Window {
  // Declare the main window custom class:
  static final mainWindowClass = WindowClass.custom(
    className: 'mainWindow',
    windowProc: Pointer.fromFunction<WindowProc>(mainWindowProc, 0),
    bgColor: RGB(255, 255, 255),
    useDarkMode: true,
    titleColor: RGB(32, 32, 32),
  );

  // Redirect to default implementation [WindowClass.windowProcDefault].
  static int mainWindowProc(int hwnd, int uMsg, int wParam, int lParam) =>
      WindowClass.windowProcDefault(
          hwnd, uMsg, wParam, lParam, mainWindowClass);

  late final TextOutput textOutput;
  late final Button buttonOK;
  late final Button buttonExit;

  MainWindow({super.width, super.height})
      : super(
          defaultRepaint: false,
          windowName: 'Win32 GUI - Example',
          windowClass: mainWindowClass,
          windowStyles: WS_MINIMIZEBOX | WS_SYSMENU,
        ) {
    textOutput =
        TextOutput(parent: this, x: 4, y: 160, width: 626, height: 250);

    buttonOK = Button(
        label: 'OK',
        parent: this,
        x: 4,
        y: 414,
        width: 100,
        height: 32,
        onCommand: (p) => print('** Button OK Click!'));

    buttonExit = Button(
        label: 'Exit',
        parent: this,
        x: 106,
        y: 414,
        width: 100,
        height: 32,
        onCommand: (p) {
          print('** Button Exit Click!');
          exit(0);
        });

    print(textOutput);
  }

  late final String imageDartLogoPath;
  late final String iconDartLogoPath;

  @override
  Future<void> load() async {
    imageDartLogoPath = await Window.resolveFilePath(
        'package:win32_gui/resources/dart-logo.bmp');

    print('-- imageDartLogoPath: $imageDartLogoPath');

    iconDartLogoPath = await Window.resolveFilePath(
        'package:win32_gui/resources/dart-icon.ico');

    print('-- iconDartLogoPath: $iconDartLogoPath');
  }

  @override
  void build(int hwnd, int hdc) {
    super.build(hwnd, hdc);

    SetTextColor(hdc, RGB(255, 255, 255));
    SetBkColor(hdc, RGB(96, 96, 96));

    // Some extra build...
  }

  @override
  void repaint(int hwnd, int hdc) {
    setIcon(iconDartLogoPath);

    var hBitmap = loadImageCached(imageDartLogoPath);
    var imgDimension = getBitmapDimension(hBitmap);

    // Valid Bitmap:
    if (imgDimension != null) {
      var imgW = imgDimension.width;
      var imgH = imgDimension.height;

      final hSpace = (dimensionWidth - imgW);
      //final vSpace = (dimensionHeight - imgH);
      final xCenter = hSpace ~/ 2;
      //final yCenter = vSpace ~/ 2;

      final x = xCenter;
      final y = 10;

      drawImage(hdc, hBitmap, x, y, imgW, imgH);
    }

    textOutput.callRepaint();
  }
}

class TextOutput extends RichEdit {
  TextOutput({super.parent, super.x, super.y, super.width, super.height})
      : super(bgColor: RGB(32, 32, 32));

  @override
  void build(int hwnd, int hdc) {
    super.build(hwnd, hdc);

    setBkColor(RGB(32, 32, 32));
    setTextColor(hdc, RGB(255, 255, 255));

    setAutoURLDetect(true);
  }

  @override
  void repaint(int hwnd, int hdc) {
    invalidateRect();

    setBkColor(RGB(32, 32, 32));
    setTextColor(hdc, RGB(255, 255, 255));

    setTextFormatted([
      TextFormatted(" -------------------------\r\n",
          color: RGB(255, 255, 255)),
      TextFormatted(" Hello", color: RGB(0, 255, 255)),
      TextFormatted(" Word! \r\n", color: RGB(0, 255, 0)),
      TextFormatted(" -------------------------\r\n",
          color: RGB(255, 255, 255)),
    ]);
  }
}