add presets for color chooser (bar color) and fix typo

src/gui/GradientDialog.cpp

@@ -6,12 +6,55 @@
 #include <QLabel>
 #include <QPainter>
 #include <QPixmap>
+#include <QComboBox>
+
+static QVector<QColor> makePreset4(const QColor &c0, const QColor &c1,
+                                   const QColor &c2, const QColor &c3,
+                                   const QColor &c4)
+{
+    return { c0, c2, c3, c4 };
+}
+
+struct Preset {
+    QString name;
+    QVector<QColor> colors; 
+};
+
+// Presets are defined in a Vector for simplicity of adding new ones
+static const QVector<Preset> PRESETS = {
+    { "Default",
+      { QColor("#078D70"), QColor("#26CEAA"), QColor("#98E8C1"), QColor("#FFFFFF") } },
+
+    { "Pastels",
+      makePreset4(QColor("#92ccdd"), QColor("#c7eff0"),
+                  QColor("#f5d5fd"), QColor("#fdc4ec"), QColor("#ffc2cb")) },
+
+    { "Raddish",
+      makePreset4(QColor("#ff0000"), QColor("#b40000"),
+                  QColor("#890000"), QColor("#540000"), QColor("#240000")) },
+
+    { "Blau",
+      makePreset4(QColor("#72c8dd"), QColor("#43b5d2"),
+                  QColor("#14a3c7"), QColor("#1293b3"), QColor("#10829f")) },
+
+    { "Turquoise",
+      makePreset4(QColor("#d8f2f6"), QColor("#8bd9ef"),
+                  QColor("#3ec1d5"), QColor("#319aaa"), QColor("#25737f")) },
+
+    { "Aqua",
+    makePreset4(QColor("#2278FB"), QColor("#3A9AF0"),
+                QColor("#53BDE6"), QColor("#6BDFDB"), QColor("#1A5BB8")) },
+
+    { "Peaches",
+    makePreset4(QColor("#FFCAA6"), QColor("#FDA8A0"),
+                QColor("#FA879A"), QColor("#F86594"), QColor("#FFE0CC")) }
+};
 
 GradientDialog::GradientDialog(const QVector<QColor> &stops,
                                QWidget *parent)
     : QDialog(parent), m_stops(stops)
 {
-    setWindowTitle("Bar Colour Gradient");
+    setWindowTitle("Spectrogram Colors");
     setMinimumSize(420, 180);
 
     auto *mainLay = new QVBoxLayout(this);
@@ -22,11 +65,13 @@ GradientDialog::GradientDialog(const QVector<QColor> &stops,
     m_preview->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
     mainLay->addWidget(m_preview);
 
-    // Colour stop buttons
     auto *btnLay = new QHBoxLayout;
     QStringList labels = { "Low", "Mid", "High", "Peak" };
-    for (int i = 0; i < m_stops.size(); ++i) {
-        auto *btn = new QPushButton(labels.value(i, QString::number(i)));
+    if (m_stops.size() != 4) {
+        m_stops = PRESETS[0].colors;
+    }
+    for (int i = 0; i < 4; ++i) {
+        auto *btn = new QPushButton(labels[i]);
         btn->setFixedSize(70, 30);
         connect(btn, &QPushButton::clicked, this, [this, i]{ onStopClicked(i); });
         btnLay->addWidget(btn);
@@ -34,15 +79,23 @@ GradientDialog::GradientDialog(const QVector<QColor> &stops,
     }
     mainLay->addLayout(btnLay);
 
-    // Action buttons
     auto *dialogBtns = new QHBoxLayout;
-    auto *resetBtn = new QPushButton("Reset to Default");
-    connect(resetBtn, &QPushButton::clicked, this, &GradientDialog::onResetToDefault);
-    dialogBtns->addWidget(resetBtn);
+
+    auto *presetLabel = new QLabel("Preset:");
+    m_presetCombo = new QComboBox;
+    for (const auto &p : PRESETS) {
+        m_presetCombo->addItem(p.name);
+    }
+    connect(m_presetCombo, QOverload<int>::of(&QComboBox::currentIndexChanged),
+            this, &GradientDialog::onPresetSelected);
+    dialogBtns->addWidget(presetLabel);
+    dialogBtns->addWidget(m_presetCombo);
     dialogBtns->addStretch();
+
     auto *ok = new QPushButton("Apply");
     connect(ok, &QPushButton::clicked, this, &QDialog::accept);
     dialogBtns->addWidget(ok);
+
     mainLay->addLayout(dialogBtns);
 
     updatePreview();
@@ -58,21 +111,18 @@ void GradientDialog::onStopClicked(int index)
     }
 }
 
-void GradientDialog::onResetToDefault()
+void GradientDialog::onPresetSelected(int index)
 {
-    m_stops = {
-        QColor("#078D70"),   // Low
-        QColor("#26CEAA"),   // Mid
-        QColor("#98E8C1"),   // High
-        QColor("#FFFFFF")    // Peak
-    };
+    if (index < 0 || index >= PRESETS.size())
+        return;
+    m_stops = PRESETS[index].colors;
     updatePreview();
 }
 
 void GradientDialog::updatePreview()
 {
     QPixmap pix(m_preview->size());
-    if (pix.width() == 0) pix = QPixmap(400, 40);  // fallback size
+    if (pix.width() == 0) pix = QPixmap(400, 40);
     pix.fill(Qt::transparent);
     QPainter p(&pix);
     QLinearGradient grad(0, 0, pix.width(), 0);

src/gui/GradientDialog.h

@@ -7,6 +7,7 @@
 
 class QPushButton;
 class QLabel;
+class QComboBox;
 
 class GradientDialog : public QDialog
 {
@@ -19,12 +20,13 @@ public:
 
 private slots:
     void onStopClicked(int index);
-    void onResetToDefault();
+    void onPresetSelected(int index);
 
 private:
     QVector<QColor>       m_stops;
     QVector<QPushButton*> m_buttons;
     QLabel               *m_preview;
+    QComboBox            *m_presetCombo;
     void updatePreview();
 };