Implement draggable split.

Next step is to allow a double click to reset the split to be
automatically resized.

1 files changed, 54 insertions, 0 deletions

diff --git a/c/layout.h b/c/layout.h
new file mode 100644
index 0000000..82189fb
--- /dev/null
+++ b/c/layout.h
@@ -0,0 +1,54 @@
+#ifndef LAYOUT_H
+#define LAYOUT_H
+
+#include <windows.h>
+
+#include "common.h"
+
+void UpdateLayout(int w = 0, int h = 0);
+
+struct Dragger
+{
+	bool HandleDown();
+	bool HandleMove();
+private:
+	bool InDragArea(int x, int y);
+	bool IsDown();
+	void Drag(int x, int y);
+	bool m_bActive = false;
+};
+
+inline bool Dragger::HandleDown()
+{
+	extern HWND g_hWnd;
+	POINT pt;
+	require(GetRelativeCursorPos(g_hWnd, &pt));
+	if (!InDragArea(pt.x, pt.y)) return false;
+	return m_bActive = true;
+}
+
+inline bool Dragger::IsDown()
+{
+	return GetKeyState(VK_LBUTTON) & 0x8000;
+}
+
+inline bool Dragger::HandleMove()
+{
+	extern HWND g_hWnd;
+	POINT pt;
+	require(GetRelativeCursorPos(g_hWnd, &pt));
+
+	extern HCURSOR g_hcSizeNs;
+	bool r = true;
+	if (InDragArea(pt.x, pt.y))
+		SetCursor(g_hcSizeNs);
+	else
+		r = false;
+	if (m_bActive)
+		Drag(pt.x, pt.y);
+	if (!IsDown())
+		m_bActive = false;
+	return r;
+}
+
+#endif