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#ifndef LAYOUT_H
#define LAYOUT_H
#include <windows.h>
#include "win.h"
/* Given main window's width and height, set appropriate positions and
* sizes for child windows. */
void UpdateLayout(int w = 0, int h = 0);
/* Dragger objects implement draggable portions of the client area,
* such as the split between two list views. HandleLButtonDown and
* HandleSetCursor are called by relevant window procedures upon
* WM_(NC)LBUTTONDOWN and WM_SETCURSOR. */
struct Dragger
{
bool HandleLButtonDown();
bool HandleSetCursor();
protected:
bool IsDown() const;
bool IsDouble(const long time, const POINT& pt);
virtual bool InDragArea(int x, int y) const;
/* Perform drag, resizing relevant windows. */
virtual void Drag(int x, int y) const;
/* Reset dragger to automatic position. */
virtual void Reset() const;
/* Called after drag, when mouse button is released. */
virtual void Done() const;
private:
bool m_bActive = false;
long m_time0 = 0;
POINT m_pt0 = {0, 0};
};
/* DlvDragger implements the draggable split between the data list
* view and the episode list view. */
struct DlvDragger : public Dragger
{
private:
bool InDragArea(int x, int y) const override;
void Drag(int x, int y) const override;
void Reset() const override;
void Done() const override;
};
/* Below follows the implementation of the non-virtual member
* functions of Dragger, on which derived objects rely. */
inline bool Dragger::IsDouble(const long time, const POINT& pt)
{
const bool dbl = time-m_time0 <= static_cast<long>(GetDoubleClickTime())
&& abs(pt.x-m_pt0.x) <= Metric<SM_CXDOUBLECLK>
&& abs(pt.y-m_pt0.y) <= Metric<SM_CYDOUBLECLK>;
m_time0 = time;
m_pt0 = std::move(pt);
return dbl;
}
inline bool Dragger::IsDown() const
{
return GetKeyState(VK_LBUTTON) & 0x8000;
}
inline bool Dragger::HandleLButtonDown()
{
extern HWND g_hWnd;
POINT pt;
Require(GetRelativeCursorPos(g_hWnd, &pt));
if (!InDragArea(pt.x, pt.y)) return false;
if (IsDouble(GetMessageTime(), pt)) {
m_bActive = false;
Reset();
} else
m_bActive = true;
return m_bActive;
}
inline bool Dragger::HandleSetCursor()
{
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)
return r;
Drag(pt.x, pt.y);
if (!IsDown()) {
m_bActive = false;
Done();
}
return r;
}
#endif
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