libui/ui_windows.h

// 7 april 2015

/*
This file assumes that you have included <windows.h> and "ui.h" beforehand. It provides API-specific functions for interfacing with foreign controls in Windows.
*/

#ifndef __UI_UI_WINDOWS_H__
#define __UI_UI_WINDOWS_H__

// uiWindowsMakeControl() initializes the given uiControl with the given Windows API control inside.
// You will need to provide the preferredSize() method yourself.
typedef struct uiWindowsMakeControlParams uiWindowsMakeControlParams;
struct uiWindowsMakeControlParams {
	// These match the CreateWindowExW() function.
	DWORD dwExStyle;
	LPCWSTR lpClassName;
	LPCWSTR lpWindowName;
	DWORD dwStyle;		// WS_CHILD and WS_VISIBLE are automatically applied.
	HINSTANCE hInstance;

	// Set this to non-FALSE to use the standard control font used by other ui controls.
	BOOL useStandardControlFont;

	// These are called when the control sends a WM_COMMAND or WM_NOTIFY (respectively) to its parent.
	// ui redirects the message back and calls these functions.
	// Store the result in *lResult and return any non-FALSE value (such as TRUE) to return the given result; return FALSE to pass the notification up to your window procedure.
	// Note that these are only issued if they come from the uiControl itself; notifications from children of the uiControl (such as a header control) will be received normally.
	BOOL (*onWM_COMMAND)(uiControl *c, WORD code, LRESULT *lResult);
	BOOL (*onWM_NOTIFY)(uiControl *c, NMHDR *nm, LRESULT *lResult);

	// This is called when the widget is ready to be destroyed.
	void (*onDestroy)(void *data);
	void *onDestroyData;
};
_UI_EXTERN void uiWindowsMakeControl(uiControl *c, uiWindowsMakeControlParams *p);

// This contains the Windows-specific parts of the uiSizing structure.
// BaseX and BaseY are the dialog base units.
// InternalLeading is the standard control font's internal leading; labels in uiForms use this for correct Y positioning.
struct uiSizingSys {
	int BaseX;
	int BaseY;
	LONG InternalLeading;

	// This is the window handle to pass to the hWndInsertAfter parameter of SetWindowPos().
	// You should set this to your own window handle when done.
	// Controls made with uiWindowsMakeControl() do this for you; you only need to do this if you are implementing uiControlResize() yourself.
	HWND InsertAfter;
};
// Use these in your preferredSize() implementation with baseX and baseY.
#define uiWindowsDlgUnitsToX(dlg, baseX) MulDiv((dlg), baseX, 4)
#define uiWindowsDlgUnitsToY(dlg, baseY) MulDiv((dlg), baseY, 8)

// and use this if you need the text of the window width
_UI_EXTERN intmax_t uiWindowsWindowTextWidth(HWND hwnd);

// these functions get and set the window text for such a uiControl
// the value returned should be freed with uiFreeText()
_UI_EXTERN char *uiWindowsControlText(uiControl *);
_UI_EXTERN void uiWindowsControlSetText(uiControl *, const char *);

struct uiControlSysFuncParams {
	int Func;
	BOOL HasTabStops;
};

enum {
	// These should enable and disable the uiControl while preserving the user enable/disable setting.
	// These are needed because while disabling a parent window does cause children to stop receiving events, they are not shown as disabled, which is not what we want.
	uiWindowsSysFuncContainerEnable,
	uiWindowsSysFuncContainerDisable,
	// This is interpreted by controls that are tab stops; the control should set HasTabStops to TRUE if so, and *LEAVE IT ALONE* if not.
	// You only need this if implementing your own uiControl.
	// Controls created with uiWindowsMakeControl() check for the window being enabled and the presence of WS_TABSTOP.
	// The name is "has tab stops" because it is used by uiTabs to say "does the current tab page have tab stops?".
	uiWindowsSysFuncHasTabStops,
};

#endif