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Widgets/public/SplitViewWidget.hpp

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+#pragma once
+
+#include "WidgetBase.hpp"
+
+namespace tp {
+	template <typename Events, typename Canvas>
+	class SplitView : public Widget<Events, Canvas> {
+	public:
+		SplitView() {
+			this->createConfig("SplitView");
+			this->addColor("Handle", "Accent");
+			this->addColor("Hovered", "Interaction");
+			this->addColor("Resizing", "Action");
+			this->addValue("Min", 200.f);
+			this->addValue("HandleSize", 7.f);
+		}
+
+		void proc(const Events& events, const tp::RectF& areaParent, const tp::RectF& aArea) override {
+			this->mArea = aArea;
+
+			if (!areaParent.isOverlap(aArea)) {
+				mResizeInProcess = false;
+				return;
+			}
+
+			mIsHover = getHandle().isInside(events.getPos());
+
+			if (events.isPressed() && mIsHover) {
+				mResizeInProcess = true;
+			} else if (!events.isDown()) {
+				mResizeInProcess = false;
+			}
+
+			if (mResizeInProcess) {
+				halnf pos = events.getPos().x;
+				auto diff = pos - (this->mArea.x + mFactor * this->mArea.z);
+				mFactor += diff / this->mArea.z;
+			}
+
+			mFactor = tp::clamp(mFactor, this->getValue("Min") / this->mArea.z, 1 - this->getValue("Min") / this->mArea.z);
+
+			if (this->getValue("Min") * 2.f > this->mArea.z) {
+				mFactor = 0.5f;
+			}
+		}
+
+		// takes whole area
+		void draw(Canvas& canvas) const override {
+			if (mResizeInProcess) canvas.rect(getHandle(), this->getColor("Resizing"));
+			else if (mIsHover) canvas.rect(getHandle(), this->getColor("Hovered"));
+			else canvas.rect(getHandle(), this->getColor("Handle"));
+		}
+
+		RectF getFirst() const {
+			return {
+				this->mArea.x, this->mArea.y, mFactor * this->mArea.z - this->getValue("HandleSize") / 2.f, this->mArea.w
+			};
+		}
+
+		RectF getSecond() const {
+			return { this->mArea.x + mFactor * this->mArea.z + this->getValue("HandleSize") / 2.f,
+							 this->mArea.y,
+							 (1.f - mFactor) * this->mArea.z - this->getValue("HandleSize") / 2.f,
+							 this->mArea.w };
+		}
+
+		RectF getHandle() const {
+			return { this->mArea.x + mFactor * this->mArea.z - this->getValue("HandleSize") / 2.f,
+							 this->mArea.y,
+							 this->getValue("HandleSize"),
+							 this->mArea.w };
+		}
+
+	public:
+		halnf mFactor = 0.7f;
+		bool mResizeInProcess = false;
+		bool mIsHover = false;
+	};
+}