Step 517: add control library restyle semantics

editor/src/ControlLibraryRestyle.h

@@ -0,0 +1,83 @@
+#pragma once
+// Step 517: Control Library Restyle
+// Shared control style semantics for depth, pressed state clarity, and DPI
+// consistency across core widgets.
+
+#include <string>
+#include <algorithm>
+
+struct ControlStyle {
+    float cornerRadius = 0.0f;
+    float borderWidth = 1.0f;
+    float depthIdle = 0.0f;
+    float depthPressed = 0.0f;
+    float labelContrast = 1.0f;
+    float iconContrast = 1.0f;
+    float strokePx = 1.0f;
+};
+
+enum class ControlKind {
+    Button,
+    Toggle,
+    Tab,
+    Menu,
+    Dropdown,
+    Checkbox
+};
+
+class ControlLibraryRestyle {
+public:
+    static ControlStyle styleFor(ControlKind kind, float dpiScale, bool pressed) {
+        float s = std::max(0.75f, std::min(3.0f, dpiScale));
+        ControlStyle c;
+        c.cornerRadius = baseRadius(kind) * s;
+        c.borderWidth = 1.0f * s;
+        c.depthIdle = baseDepth(kind) * s;
+        c.depthPressed = (baseDepth(kind) + 1.4f) * s;
+        c.labelContrast = 6.0f;
+        c.iconContrast = 4.0f;
+        c.strokePx = std::max(1.0f, 1.2f * s);
+        if (pressed) {
+            c.depthIdle = c.depthPressed;
+        }
+        return c;
+    }
+
+    static bool hasClearPressedSignal(const ControlStyle& idle,
+                                      const ControlStyle& pressed) {
+        return pressed.depthIdle > idle.depthIdle + 0.6f;
+    }
+
+    static bool validContrast(const ControlStyle& c) {
+        return c.labelContrast >= 4.5f && c.iconContrast >= 3.0f;
+    }
+
+    static bool dpiStable(const ControlStyle& lo, const ControlStyle& hi) {
+        return hi.cornerRadius > lo.cornerRadius && hi.strokePx >= lo.strokePx;
+    }
+
+private:
+    static float baseRadius(ControlKind kind) {
+        switch (kind) {
+            case ControlKind::Button: return 4.0f;
+            case ControlKind::Toggle: return 7.0f;
+            case ControlKind::Tab: return 3.0f;
+            case ControlKind::Menu: return 2.0f;
+            case ControlKind::Dropdown: return 4.0f;
+            case ControlKind::Checkbox: return 2.0f;
+        }
+        return 3.0f;
+    }
+
+    static float baseDepth(ControlKind kind) {
+        switch (kind) {
+            case ControlKind::Button: return 1.2f;
+            case ControlKind::Toggle: return 1.6f;
+            case ControlKind::Tab: return 1.0f;
+            case ControlKind::Menu: return 0.8f;
+            case ControlKind::Dropdown: return 1.1f;
+            case ControlKind::Checkbox: return 0.9f;
+        }
+        return 1.0f;
+    }
+};