#pragma once

/* Control extended styles */
#define MSLM_EX_ALLOWSELECTNONE 0x1
#define MSLM_EX_ALLOWSELECTDISABLED 0x2
#define MSLM_EX_HIDENUMBERONSINGLE  0x4
#define MSLM_EX_HIDENUMBERS 0x8
#define MSLM_EX_SELECTONRIGHTCLICK  0x10
#define MSLM_EX_SELECTBYNUMKEY  0x20
#define MSLM_EX_SELECTBYARROWKEY    0x40

/* MONSL_MONINFO Flags */
#define MSL_MIF_DISABLED    0x1

typedef struct _MONSL_MONINFO
{
    POINT Position;
    SIZE Size;
    DWORD Flags; /* MSL_MIF_* */
    LPARAM lParam;
} MONSL_MONINFO, *PMONSL_MONINFO;

typedef struct _MONSL_MONNMHDR
{
    NMHDR hdr;
    INT Index;
    /* NOTE: MonitorInfo is only valid if Index >= 0 */
    MONSL_MONINFO MonitorInfo;
} MONSL_MONNMHDR, *PMONSL_MONNMHDR;

typedef struct _MONSL_MONNMBUTTONCLICKED
{
    /* Used with MSLN_MONITORCHANGING */
    MONSL_MONNMHDR hdr;
    POINT pt;
} MONSL_MONNMBUTTONCLICKED, *PMONSL_MONNMBUTTONCLICKED;

typedef struct _MONSL_MONNMMONITORCHANGING
{
    /* Used with MSLN_MONITORCHANGING */
    MONSL_MONNMHDR hdr;
    INT PreviousSelected;
    BOOL AllowChanging;
} MONSL_MONNMMONITORCHANGING, *PMONSL_MONNMMONITORCHANGING;

/*
 * MSLN_MONITORCHANGING
 *   This notification code is sent through WM_NOTIFY before another monitor
 *   can be selected. This notification is not sent in response to a
 *   MSLM_SETCURSEL message.
 *
 *   lParam: PMONSL_MONNMMONITORCHANGING
 *           Change AllowChanging to FALSE to prevent the new monitor to
 *           be selected.
 */
#define MSLN_MONITORCHANGING    101

/*
 * MSLN_MONITORCHANGED
 *   This notification code is sent through WM_NOTIFY after a new monitor
 *   was selected. This notification is not sent in response to a
 *   MSLM_SETCURSEL message.
 *
 *   lParam: PMONSL_MONNMHDR
 */
#define MSLN_MONITORCHANGED 102

/*
 * MSLN_RBUTTONUP
 *   This notification code is sent through WM_NOTIFY after the user did a
 *   right click on the control. If the control's extended style
 *   MSLM_EX_SELECTONRIGHTCLICK is set and the user clicked on a monitor,
 *   that monitor is selected and relevant notifications are sent before
 *   this notification is sent.
 *
 *   lParam: PMONSL_MONNMBUTTONCLICKED
 */
#define MSLN_RBUTTONUP  103

/*
 * MSLM_SETMONITORSINFO
 *   wParam: DWORD
 *           Count of MONSL_MONINFO structures provided as lParam.
 *   lParam: PMONSL_MONINFO
 *           Array of wParam MONSL_MONINFO structures.
 *
 *   Returns non-zero value if successful.
 */
#define MSLM_SETMONITORSINFO (WM_USER + 0x10)

/*
 * MSLM_GETMONITORSINFO
 *   wParam: DWORD
 *           Length of MONSL_MONINFO array buffer provided in lParam.
 *   lParam: PMONSL_MONINFO
 *           Array of wParam MONSL_MONINFO structures
 *
 *   Returns number of structures copied.
 */
#define MSLM_GETMONITORSINFO (WM_USER + 0x11)

/*
 * MSLM_GETMONITORINFOCOUNT
 *   wParam: Ignored.
 *   lParam: Ignored.
 *
 *   Returns number of monitors.
 */
#define MSLM_GETMONITORINFOCOUNT    (WM_USER + 0x12)

/*
 * MSLM_HITTEST
 *   wParam: PPOINT
 *           Pointer to a POINT structure specifying the coordinates
 *           relative to the client area of the control.
 *   lParam: Ignored.
 *
 *   Returns the index of the monitor at this point, or -1.
 */
#define MSLM_HITTEST    (WM_USER + 0x13)

/*
 * MSLM_SETCURSEL
 *   wParam: INT
 *           Selects the monitor with this index. Pass -1 to clear the selection.
 *   lParam: Ignored.
 *
 *   Returns a non-zero value if successful.
 */
#define MSLM_SETCURSEL  (WM_USER + 0x14)

/*
 * MSLM_GETCURSEL
 *   wParam: Ignored.
 *   lParam: Ignored.
 *
 *   Returns the index of the selected monitor, or -1 if none is currently selected.
 */
#define MSLM_GETCURSEL  (WM_USER + 0x15)

/*
 * MSLM_SETMONITORINFO
 *   wParam: INT
 *           Index of the monitor information that is queried.
 *   lParam: PMONSL_MONINFO
 *           Pointer to a MONSL_MONINFO structures.
 *
 *   Returns non-zero value if successful.
 */
#define MSLM_SETMONITORINFO (WM_USER + 0x16)

/*
 * MSLM_GETMONITORINFO
 *   wParam: INT
 *           Index of the monitor information to be changed.
 *   lParam: PMONSL_MONINFO
 *           Pointer to a MONSL_MONINFO structures.
 *
 *   Returns non-zero value if successful.
 */
#define MSLM_GETMONITORINFO (WM_USER + 0x17)

/*
 * MSLM_SETEXSTYLE
 *   wParam: Ignored.
 *   lParam: DWORD
 *           Can be a combination of the following flags:
 *             * MSLM_EX_ALLOWSELECTNONE
 *                 Allow deselecting a monitor by clicking into
 *                 unused areas of the control.
 *             * MSLM_EX_ALLOWSELECTDISABLED
 *                 Allow selecting disabled monitors.
 *             * MSLM_EX_HIDENUMBERONSINGLE
 *                 Hides the monitor number if the control only
 *                 displays one monitor.
 *             * MSLM_EX_HIDENUMBERS
 *                 Does not show monitor numbers.
 *             * MSLM_EX_SELECTONRIGHTCLICK
 *                 Selects a monitor when the user right clicks
 *                 on it.
 *             * MSLM_EX_SELECTBYNUMKEY
 *                 Allows selecting a monitor by using the keys
 *                 '1' to '9'.
 *             * MSLM_EX_SELECTBYARROWKEY
 *                 Allows selecting a monitor using the arrow keys.
 *
 *   Returns non-zero value if successful.
 */
#define MSLM_SETEXSTYLE (WM_USER + 0x18)

/*
 * MSLM_GETEXSTYLE
 *   wParam: Ignored.
 *   lParam: Ignored
 *
 *   Returns the control's extended style flags.
 */
#define MSLM_GETEXSTYLE (WM_USER + 0x19)

/*
 * MSLM_GETMONITORRECT
 *   wParam: INT
 *           Index of the monitor whose display rectangle is queried.
 *   lParam: PRECT
 *           Pointer to a RECT structure that receives the rectangle
 *           in coordinates relative to the control's client area.
 *
 *   Returns a positive value if the rectangle is visible.
 *   Returns zero if the rectangle is invisible.
 *   Returns a negative value if the index is not valid.
 */
#define MSLM_GETMONITORRECT (WM_USER + 0x20)

BOOL RegisterMonitorSelectionControl(IN HINSTANCE hInstance);
VOID UnregisterMonitorSelectionControl(IN HINSTANCE hInstance);