Add style() getter in QApplication (#249)

Add minimal QStyle implementation with just pixelMetric getter
 (allow getting the scrollbars width)

CMakeLists.txt

@@ -45,6 +45,7 @@ add_library(${CORE_WIDGETS_ADDON} SHARED
     "${PROJECT_SOURCE_DIR}/src/cpp/lib/QtGui/QCursor/qcursor_wrap.cpp"
     "${PROJECT_SOURCE_DIR}/src/cpp/lib/QtGui/QKeySequence/qkeysequence_wrap.cpp"
     "${PROJECT_SOURCE_DIR}/src/cpp/lib/QtGui/QMovie/qmovie_wrap.cpp"
+    "${PROJECT_SOURCE_DIR}/src/cpp/lib/QtGui/QStyle/qstyle_wrap.cpp"
     "${PROJECT_SOURCE_DIR}/src/cpp/lib/QtCore/QObject/qobject_wrap.cpp"
     "${PROJECT_SOURCE_DIR}/src/cpp/lib/QtCore/QVariant/qvariant_wrap.cpp"
     "${PROJECT_SOURCE_DIR}/src/cpp/lib/QtCore/QSize/qsize_wrap.cpp"

src/cpp/include/nodegui/QtGui/QApplication/qapplication_wrap.h

@@ -34,4 +34,5 @@ class QApplicationWrap : public Napi::ObjectWrap<QApplicationWrap> {
 namespace StaticQApplicationWrapMethods {
 Napi::Value instance(const Napi::CallbackInfo& info);
 Napi::Value clipboard(const Napi::CallbackInfo& info);
-}  // namespace StaticQApplicationWrapMethods
+Napi::Value style(const Napi::CallbackInfo& info);
+}  // namespace StaticQApplicationWrapMethods

src/cpp/include/nodegui/QtGui/QStyle/qstyle_wrap.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <napi.h>
+
+#include <QStyle>
+
+#include "core/Component/component_macro.h"
+
+class QStyleWrap : public Napi::ObjectWrap<QStyleWrap> {
+ private:
+  QStyle* instance;
+
+ public:
+  static Napi::FunctionReference constructor;
+  static Napi::Object init(Napi::Env env, Napi::Object exports);
+  QStyleWrap(const Napi::CallbackInfo& info);
+  QStyle* getInternalInstance();
+  // Wrapped methods
+  Napi::Value pixelMetric(const Napi::CallbackInfo& info);
+
+  COMPONENT_WRAPPED_METHODS_DECLARATION
+};

src/cpp/lib/QtGui/QApplication/qapplication_wrap.cpp

@@ -2,6 +2,7 @@
 
 #include "Extras/Utils/nutils.h"
 #include "QtGui/QClipboard/qclipboard_wrap.h"
+#include "QtGui/QStyle/qstyle_wrap.h"
 
 Napi::FunctionReference QApplicationWrap::constructor;
 int QApplicationWrap::argc = 0;
@@ -22,6 +23,7 @@ Napi::Object QApplicationWrap::init(Napi::Env env, Napi::Object exports) {
                       &QApplicationWrap::quitOnLastWindowClosed),
        StaticMethod("instance", &StaticQApplicationWrapMethods::instance),
        StaticMethod("clipboard", &StaticQApplicationWrapMethods::clipboard),
+       StaticMethod("style", &StaticQApplicationWrapMethods::style),
        COMPONENT_WRAPPED_METHODS_EXPORT_DEFINE});
   constructor = Napi::Persistent(func);
   exports.Set(CLASSNAME, func);
@@ -99,6 +101,15 @@ Napi::Value StaticQApplicationWrapMethods::clipboard(
       {Napi::External<QClipboard>::New(env, clipboard)});
 }
 
+Napi::Value StaticQApplicationWrapMethods::style(
+    const Napi::CallbackInfo& info) {
+  Napi::Env env = info.Env();
+  Napi::HandleScope scope(env);
+  QStyle* style = QApplication::style();
+  return QStyleWrap::constructor.New(
+      {Napi::External<QStyle>::New(env, style)});
+}
+
 Napi::Value QApplicationWrap::setQuitOnLastWindowClosed(
     const Napi::CallbackInfo& info) {
   Napi::Env env = info.Env();
@@ -115,4 +126,4 @@ Napi::Value QApplicationWrap::quitOnLastWindowClosed(
   Napi::HandleScope scope(env);
   bool quit = this->instance->quitOnLastWindowClosed();
   return Napi::Value::From(env, quit);
-}
+}

src/cpp/lib/QtGui/QStyle/qstyle_wrap.cpp

@@ -0,0 +1,41 @@
+#include "QtGui/QStyle/qstyle_wrap.h"
+
+#include "Extras/Utils/nutils.h"
+
+Napi::FunctionReference QStyleWrap::constructor;
+
+Napi::Object QStyleWrap::init(Napi::Env env, Napi::Object exports) {
+  Napi::HandleScope scope(env);
+  char CLASSNAME[] = "QStyle";
+  Napi::Function func =
+      DefineClass(env, CLASSNAME,
+                  {InstanceMethod("pixelMetric", &QStyleWrap::pixelMetric),
+                   COMPONENT_WRAPPED_METHODS_EXPORT_DEFINE});
+  constructor = Napi::Persistent(func);
+  exports.Set(CLASSNAME, func);
+  return exports;
+}
+
+QStyleWrap::QStyleWrap(const Napi::CallbackInfo& info)
+    : Napi::ObjectWrap<QStyleWrap>(info) {
+  Napi::Env env = info.Env();
+  Napi::HandleScope scope(env);
+  if (info[0].IsExternal()) {
+    this->instance = info[0].As<Napi::External<QStyle>>().Data();
+  } else {
+    Napi::TypeError::New(env, "Incorrect initialization of QStyleWrap")
+        .ThrowAsJavaScriptException();
+  }
+  this->rawData = extrautils::configureComponent(this->getInternalInstance());
+}
+
+QStyle* QStyleWrap::getInternalInstance() { return this->instance; }
+
+Napi::Value QStyleWrap::pixelMetric(const Napi::CallbackInfo& info) {
+  Napi::Env env = info.Env();
+  Napi::HandleScope scope(env);
+  int metricInt = info[0].As<Napi::Number>().Int32Value();
+  QStyle::PixelMetric metric = static_cast<QStyle::PixelMetric>(metricInt);
+
+  return Napi::Value::From(env, this->instance->pixelMetric(metric));
+}

src/cpp/main.cpp

@@ -14,6 +14,7 @@
 #include "QtGui/QKeySequence/qkeysequence_wrap.h"
 #include "QtGui/QMovie/qmovie_wrap.h"
 #include "QtGui/QPixmap/qpixmap_wrap.h"
+#include "QtGui/QStyle/qstyle_wrap.h"
 #include "QtWidgets/QAction/qaction_wrap.h"
 #include "QtWidgets/QBoxLayout/qboxlayout_wrap.h"
 #include "QtWidgets/QCheckBox/qcheckbox_wrap.h"
@@ -57,6 +58,7 @@ Napi::Object Main(Napi::Env env, Napi::Object exports) {
   QKeySequenceWrap::init(env, exports);
   QIconWrap::init(env, exports);
   QMovieWrap::init(env, exports);
+  QStyleWrap::init(env, exports);
   QCursorWrap::init(env, exports);
   QBoxLayoutWrap::init(env, exports);
   QGridLayoutWrap::init(env, exports);

src/index.ts

@@ -11,6 +11,7 @@ export { QMovie, CacheMode, MovieState, QMovieEvents } from './lib/QtGui/QMovie'
 export { QCursor } from './lib/QtGui/QCursor';
 export { QTextOptionWrapMode } from './lib/QtGui/QTextOption';
 export { QClipboard, QClipboardMode } from './lib/QtGui/QClipboard';
+export { QStyle, QStylePixelMetric } from './lib/QtGui/QStyle';
 // Events: Maybe a separate module ?
 export { QKeyEvent } from './lib/QtGui/QEvent/QKeyEvent';
 export { QMouseEvent } from './lib/QtGui/QEvent/QMouseEvent';

src/lib/QtGui/QApplication.ts

@@ -2,6 +2,7 @@ import addon from '../utils/addon';
 import { Component, NativeElement } from '../core/Component';
 import { checkIfNativeElement } from '../utils/helpers';
 import { QClipboard } from './QClipboard';
+import { QStyle } from './QStyle';
 
 type arg = NativeElement;
 export class QApplication extends Component {
@@ -39,4 +40,7 @@ export class QApplication extends Component {
     quitOnLastWindowClosed(): boolean {
         return this.native.quitOnLastWindowClosed();
     }
+    static style(): QStyle {
+        return new QStyle(addon.QApplication.style());
+    }
 }

src/lib/QtGui/QStyle.ts

@@ -0,0 +1,65 @@
+import { Component, NativeElement } from '../core/Component';
+import { checkIfNativeElement } from '../utils/helpers';
+
+export class QStyle extends Component {
+    native: NativeElement;
+    constructor(native: NativeElement) {
+        super();
+        if (checkIfNativeElement(native)) {
+            this.native = native;
+        } else {
+            throw new Error('QStyle cannot be initialised this way. Use QApplication::style()');
+        }
+    }
+
+    pixelMetric(metric: QStylePixelMetric): number {
+        return this.native.pixelMetric(metric);
+    }
+}
+
+export enum QStylePixelMetric {
+    PM_ButtonMargin = 0,
+    PM_ButtonDefaultIndicator = 1,
+    PM_MenuButtonIndicator = 2,
+    PM_ButtonShiftHorizontal = 3,
+    PM_ButtonShiftVertical = 4,
+    PM_DefaultFrameWidth = 5,
+    PM_SpinBoxFrameWidth = 6,
+    PM_ComboBoxFrameWidth = 7,
+    PM_MaximumDragDistance = 8,
+    PM_ScrollBarExtent = 9,
+    PM_ScrollBarSliderMin = 10,
+    PM_SliderThickness = 11,
+    PM_SliderControlThickness = 12,
+    PM_SliderLength = 13,
+    PM_SliderTickmarkOffset = 14,
+    PM_SliderSpaceAvailable = 15,
+    PM_DockWidgetSeparatorExtent = 16,
+    PM_DockWidgetHandleExtent = 17,
+    PM_DockWidgetFrameWidth = 18,
+    PM_MenuBarPanelWidth = 33,
+    PM_MenuBarItemSpacing = 34,
+    PM_MenuBarHMargin = 36,
+    PM_MenuBarVMargin = 35,
+    PM_TabBarTabOverlap = 19,
+    PM_TabBarTabHSpace = 20,
+    PM_TabBarTabVSpace = 21,
+    PM_TabBarBaseHeight = 22,
+    PM_TabBarBaseOverlap = 23,
+    PM_ProgressBarChunkWidth = 24,
+    PM_SplitterWidth = 25,
+    PM_TitleBarHeight = 26,
+    PM_IndicatorWidth = 37,
+    PM_IndicatorHeight = 38,
+    PM_ExclusiveIndicatorWidth = 39,
+    PM_ExclusiveIndicatorHeight = 40,
+    PM_MenuPanelWidth = 30,
+    PM_MenuHMargin = 28,
+    PM_MenuVMargin = 29,
+    PM_MenuScrollerHeight = 27,
+    PM_MenuTearoffHeight = 31,
+    PM_MenuDesktopFrameWidth = 32,
+    PM_CheckListButtonSize = 41,
+    PM_CheckListControllerSize = 42,
+    PM_MdiSubWindowFrameWidth = 46,
+}