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Source/Components/RangeSelector.h

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+/*
+  ==============================================================================
+
+    RangeSelection.h
+    Created: 16 May 2024 8:28:47pm
+    Author:  binya
+
+  ==============================================================================
+*/
+
+#pragma once
+
+#include <JuceHeader.h>
+
+#include "../Utilities/ComponentUtils.h"
+
+/** A component that allows the user to select a range of a display */
+class RangeSelector final : public CustomComponent
+{
+public:
+    RangeSelector()
+    {
+        cancelRangeSelect();
+    }
+
+    /** Begin the range selection prompt */
+    void promptRangeSelect(const std::function<void(int startPos, int endPos)>& onCloseCallback = {})
+    {
+        isSelecting = true;
+        draggingStarted = false;
+        onSelectedCallback = onCloseCallback;
+
+        setVisible(true);
+        setInterceptsMouseClicks(true, false);
+        resized();
+    }
+
+    /** Cancel the prompt */
+    void cancelRangeSelect()
+    {
+        isSelecting = false;
+        setVisible(false);
+        setInterceptsMouseClicks(false, false);
+        resized();
+    }
+
+    bool isSelectingRange() const
+    {
+        return isSelecting;
+    }
+
+private:
+    void paint(juce::Graphics& g) override
+    {
+        if (!isSelecting)
+            return;
+
+        auto colors = getTheme();
+
+        if (draggingStarted)
+        {
+            int x = juce::jmin(startLoc, endLoc);
+            int width = juce::jmax(startLoc, endLoc) - x;
+
+            g.setColour(colors.slate.withAlpha(0.15f));
+            g.fillRect(x, 0, width, getHeight());
+
+            g.setColour(colors.slate);
+            g.fillRect(float(startLoc), 0.f, getWidth() * Layout::boundsWidth / 2.f, float(getHeight()));
+            g.fillRect(float(endLoc), 0.f, getWidth() * Layout::boundsWidth / 2.f, float(getHeight()));
+        }
+        else
+        {
+            int mousePos = getMouseXYRelative().getX();
+
+            g.setColour(colors.slate);
+            g.fillRect(float(mousePos), 0.f, getWidth() * Layout::boundsWidth / 2.f, float(getHeight()));
+        }
+    }
+
+    void mouseDown(const juce::MouseEvent& event) override
+    {
+        if (isSelecting && !draggingStarted)
+        {
+            draggingStarted = true;
+            startLoc = endLoc = juce::jlimit<int>(getX(), getRight(), event.x);
+        }
+    }
+
+    void mouseDrag(const juce::MouseEvent& event) override
+    {
+        if (isSelecting && draggingStarted)
+        {
+            endLoc = juce::jlimit<int>(getX(), getRight(), event.x);
+            repaint();
+        }
+    }
+
+    void mouseUp(const juce::MouseEvent& event) override
+    {
+        if (isSelecting && draggingStarted)
+        {
+            endLoc = juce::jlimit<int>(getX(), getRight(), event.x);
+
+            int leftLoc = juce::jmin(startLoc, endLoc);
+            int rightLoc = juce::jmax(startLoc, endLoc);
+
+            cancelRangeSelect();  // To hide the component
+            onSelectedCallback(leftLoc, rightLoc);
+        }
+    }
+
+    void mouseMove(const juce::MouseEvent&) override
+    {
+        repaint();
+    }
+
+    //==============================================================================
+    bool isSelecting{ false };
+    bool draggingStarted{ false };
+    int startLoc{ 0 }, endLoc{ 0 };
+    std::function<void(int, int)> onSelectedCallback;
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (RangeSelector)
+};