KnobGuiColor: replace QColorDialog with ColorSelector (#657)

* Gui: Added QtColorTriangle from Qt Solutions

Maintained in Natron under the GNU Lesser General Public 2.1 license.

Updated to work in Qt4 and Qt5.

* Gui/ScaleSliderQWidget: support custom slider color

* Gui: added ColorSelectorWidget

* Gui/KnobGuiColor: replace QColorDialog with ColorSelectorWidget

* Gui/ColorSelectorWidget: added tooltips

* Gui/ColorSelectorWidget: added hsv sliders

* Gui/ColorSelectorWidget: minor ui

* Gui/ColorSelectorWidget: ui changes

* Gui/ColorSelectorWidget: hsv slider fix

forgot to set slider value when spinbox changed.

Gui/ColorSelectorWidget.h

@@ -0,0 +1,156 @@
+/* ***** BEGIN LICENSE BLOCK *****
+ * This file is part of Natron <https://natrongithub.github.io/>,
+ * (C) 2018-2021 The Natron developers
+ * (C) 2013-2018 INRIA and Alexandre Gauthier-Foichat
+ *
+ * Natron is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Natron is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Natron.  If not, see <http://www.gnu.org/licenses/gpl-2.0.html>
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef Gui_ColorSelectorWidget_h
+#define Gui_ColorSelectorWidget_h
+
+#include "Global/Macros.h"
+
+CLANG_DIAG_OFF(deprecated)
+CLANG_DIAG_OFF(uninitialized)
+#include <QWidget>
+#include <QColor>
+#include "Gui/QtColorTriangle.h" // from Qt Solutions
+#include <QMouseEvent>
+#include <QEvent>
+#include <QStackedWidget>
+CLANG_DIAG_ON(deprecated)
+CLANG_DIAG_ON(uninitialized)
+
+#include "Gui/ScaleSliderQWidget.h"
+#include "Gui/SpinBox.h"
+#include "Gui/LineEdit.h"
+#include "Gui/Button.h"
+
+NATRON_NAMESPACE_ENTER
+
+class ColorSelectorWidget : public QWidget
+{
+    Q_OBJECT
+
+public:
+
+    explicit ColorSelectorWidget(QWidget *parent = NULL);
+    void getColor(float *r, float *g, float *b, float *a);
+
+Q_SIGNALS:
+
+    void colorChanged(float r, float g, float b, float a);
+    void updateColor();
+
+public Q_SLOTS:
+
+    void setColor(float r, float g, float b, float a);
+
+private:
+
+    SpinBox *_spinR;
+    SpinBox *_spinG;
+    SpinBox *_spinB;
+    SpinBox *_spinH;
+    SpinBox *_spinS;
+    SpinBox *_spinV;
+    SpinBox *_spinA;
+
+    ScaleSliderQWidget *_slideR;
+    ScaleSliderQWidget *_slideG;
+    ScaleSliderQWidget *_slideB;
+    ScaleSliderQWidget *_slideH;
+    ScaleSliderQWidget *_slideS;
+    ScaleSliderQWidget *_slideV;
+    ScaleSliderQWidget *_slideA;
+
+    QtColorTriangle *_triangle;
+
+    LineEdit *_hex;
+
+    Button *_button;
+
+    QStackedWidget *_stack;
+
+    void setRedChannel(float value);
+    void setGreenChannel(float value);
+    void setBlueChannel(float value);
+    void setHueChannel(float value);
+    void setSaturationChannel(float value);
+    void setValueChannel(float value);
+    void setAlphaChannel(float value);
+    void setTriangle(float r, float g, float b, float a);
+    void setHex(const QColor &color);
+
+    void announceColorChange();
+
+    void setTriangleSize();
+
+private Q_SLOTS:
+
+    void handleTriangleColorChanged(const QColor &color, bool announce = true);
+
+    void manageColorRGBChanged(bool announce = true);
+    void manageColorHSVChanged(bool announce = true);
+    void manageColorAlphaChanged(bool announce = true);
+
+    void handleSpinRChanged(double value);
+    void handleSpinGChanged(double value);
+    void handleSpinBChanged(double value);
+    void handleSpinHChanged(double value);
+    void handleSpinSChanged(double value);
+    void handleSpinVChanged(double value);
+    void handleSpinAChanged(double value);
+
+    void handleHexChanged();
+
+    void handleSliderRMoved(double value);
+    void handleSliderGMoved(double value);
+    void handleSliderBMoved(double value);
+    void handleSliderHMoved(double value);
+    void handleSliderSMoved(double value);
+    void handleSliderVMoved(double value);
+    void handleSliderAMoved(double value);
+
+    void setSliderHColor();
+    void setSliderSColor();
+    void setSliderVColor();
+
+    void handleButtonClicked(bool checked);
+
+    // workaround for QToolButton+QWidgetAction
+    // triggered signal(s) are never emitted!?
+    bool event(QEvent*e) override
+    {
+        if (e->type() == QEvent::Show) {
+            Q_EMIT updateColor();
+        }
+        return QWidget::event(e);
+    }
+
+    // https://bugreports.qt.io/browse/QTBUG-47406
+    void mousePressEvent(QMouseEvent *e) override
+    {
+        e->accept();
+    }
+    void mouseReleaseEvent(QMouseEvent *e) override
+    {
+        e->accept();
+    }
+};
+
+NATRON_NAMESPACE_EXIT
+
+#endif // Gui_ColorSelectorWidget_h

Gui/Gui.pro

@@ -80,6 +80,7 @@ SOURCES += \
     ChannelsComboBox.cpp \
     ClickableLabel.cpp \
     ColoredFrame.cpp \
+    ColorSelectorWidget.cpp \
     ComboBox.cpp \
     CurveEditor.cpp \
     CurveEditorUndoRedo.cpp \
@@ -183,6 +184,7 @@ SOURCES += \
     PropertiesBinWrapper.cpp \
     PyGuiApp.cpp \
     PythonPanels.cpp \
+    QtColorTriangle.cpp \
     QtEnumConvert.cpp \
     RenderStatsDialog.cpp \
     ResizableMessageBox.cpp \
@@ -235,6 +237,7 @@ HEADERS += \
     ChannelsComboBox.h \
     ClickableLabel.h \
     ColoredFrame.h \
+    ColorSelectorWidget.h \
     ComboBox.h \
     CurveEditor.h \
     CurveEditorUndoRedo.h \
@@ -324,6 +327,7 @@ HEADERS += \
     PyGuiApp.h \
     Pyside_Gui_Python.h \
     PythonPanels.h \
+    QtColorTriangle.h \
     QtEnumConvert.h \
     RegisteredTabs.h \
     RenderStatsDialog.h \