Add color input to grid settings

include/ui/colorinputwidget.h

@@ -0,0 +1,45 @@
+#ifndef COLORINPUTWIDGET_H
+#define COLORINPUTWIDGET_H
+
+#include <QGroupBox>
+#include <QValidator>
+
+namespace Ui {
+class ColorInputWidget;
+}
+
+
+class ColorInputWidget : public QGroupBox {
+    Q_OBJECT
+public:
+    explicit ColorInputWidget(QWidget *parent = nullptr);
+    explicit ColorInputWidget(const QString &title, QWidget *parent = nullptr);
+    ~ColorInputWidget();
+
+    void setColor(QRgb color);
+    QRgb color() const { return m_color; }
+
+    bool setBitDepth(int bits);
+    int bitDepth() const { return m_bitDepth; }
+
+signals:
+    void colorChanged(QRgb color);
+    void bitDepthChanged(int bits);
+
+private:
+    Ui::ColorInputWidget *ui;
+
+    QRgb m_color = 0;
+    int m_bitDepth = 0;
+
+    void init();
+    void updateColorUi();
+    void pickColor();
+    void blockEditSignals(bool block);
+
+    void setRgbFromSliders();
+    void setRgbFromSpinners();
+    void setRgbFromHexString(const QString &);
+};
+
+#endif // COLORINPUTWIDGET_H

include/ui/gridsettingsdialog.h

@@ -34,6 +34,7 @@ private slots:
     void on_spinBox_X_valueChanged(int value);
     void on_spinBox_Y_valueChanged(int value);
     void on_comboBox_Style_currentIndexChanged(int index);
+    void onColorChanged(QRgb color);
 };
 
 inline bool operator==(const struct GridSettings &a, const struct GridSettings &b) {