ugfx/include/gwin/gwidget.h

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/*
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* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
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* http://ugfx.org/license.html
*/
/**
* @file include/gwin/gwidget.h
* @brief GWIN Widgets header file.
*/
#ifndef _GWIDGET_H
#define _GWIDGET_H
/* This file is included within "gwin/gwin.h" */
/**
* @defgroup Widget Widget
* @ingroup GWIN
*
* @details A Widget is a GWindow that supports interacting with the user
* via an input device such as a mouse or toggle buttons. It is the
* base class for widgets such as buttons and sliders.
*
* @pre GFX_USE_GWIN and GWIN_NEED_WIDGET must be set to TRUE in your gfxconf.h
* @{
*/
// Forward definition
struct GWidgetObject;
/**
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* @brief The GColorSet structure
* @{
*/
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typedef struct GColorSet {
color_t text; // @< The text color
color_t edge; // @< The edge color
color_t fill; // @< The fill color
color_t progress; // @< The color of progress bars
} GColorSet;
/* @} */
/**
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* @brief The GWidgetStyle structure
* @details A GWidgetStyle is a set of colors that together form a "style".
* These colors should not be confused with the GWindow foreground
* and background colors which are used for drawing operations.
* @{
*/
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typedef struct GWidgetStyle {
color_t background; // @< The window background color
GColorSet enabled; // @< The colors when enabled
GColorSet disabled; // @< The colors when disabled
GColorSet pressed; // @< The colors when pressed
} GWidgetStyle;
/* @} */
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/**
* @brief We define a couple of GWidgetStyle's that you can use in your
* application. The Black style is the default style if you don't
* specify one.
* @note BlackWidgetStyle means that it is designed for a Black background.
* Similarly WhiteWidgetStyle is designed for a White background.
* @{
*/
extern const GWidgetStyle BlackWidgetStyle;
extern const GWidgetStyle WhiteWidgetStyle;
/* @} */
/**
* @brief Defines a custom drawing function for a widget
*/
typedef void (*CustomWidgetDrawFunction)(struct GWidgetObject *gw, void *param);
/**
* @brief The structure to initialise a widget.
*
* @note Some widgets may have extra parameters.
* @note The text element must be static string (not stack allocated). If you want to use
* a dynamic string (eg a stack allocated string) use NULL for this member and then call
* @p gwinSetText() with useAlloc set to TRUE.
*
* @{
*/
typedef struct GWidgetInit {
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GWindowInit g; // @< The GWIN initializer
const char * text; // @< The initial text
CustomWidgetDrawFunction customDraw; // @< A custom draw function - use NULL for the standard
void * customParam; // @< A parameter for the custom draw function (default = NULL)
const GWidgetStyle * customStyle; // @< A custom style to use - use NULL for the default style
} GWidgetInit;
/* @} */
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/**
* @brief The GWIN Widget structure
* @note A widget is a GWIN window that accepts user input.
* It also has a number of other properties such as its ability
* to redraw itself (a widget maintains drawing state).
* @note Do not access the members directly. Treat it as a black-box and use the method functions.
*
* @{
*/
typedef struct GWidgetObject {
GWindowObject g; // @< This is still a GWIN
const char * text; // @< The widget text
CustomWidgetDrawFunction fnDraw; // @< The current draw function
void * fnParam; // @< A parameter for the current draw function
const GWidgetStyle * pstyle; // @< The current widget style colors
} GWidgetObject;
/* @} */
/**
* A comment/rant on the above structure:
* We would really like the GWindowObject member to be anonymous. While this is
* allowed under the C11, C99, GNU and various other standards which have been
* around forever - compiler support often requires special flags e.g
* gcc requires the -fms-extensions flag (no wonder the language and compilers have
* not really progressed in 30 years). As portability is a key requirement
* we unfortunately won't use this useful feature in case we get a compiler that
* won't support it even with special flags.
*/
#ifdef __cplusplus
extern "C" {
#endif
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/**
* @brief Set the default style for widgets created hereafter.
*
* @param[in] pstyle The default style. Passing NULL uses the system compiled style.
* @param[in] updateAll If TRUE then all existing widgets that are using the current default style
* will be updated to use this new style. Widgets that have custom styles different
* from the default style will not be updated.
*
* @note The style must be allocated statically (not on the stack) as only the pointer is stored.
*
* @api
*/
void gwinSetDefaultStyle(const GWidgetStyle *pstyle, bool_t updateAll);
/**
* @brief Get the current default style.
*
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* @return The current default style.
*
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* @api
*/
const GWidgetStyle *gwinGetDefaultStyle(void);
/**
* @brief Set the text of a widget.
*
* @param[in] gh The widget handle
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* @param[in] text The text to set. This must be a constant string unless useAlloc is set.
* @param[in] useAlloc If TRUE the string specified will be copied into dynamically allocated memory.
*
* @note The widget is automatically redrawn
* @note Non-widgets will ignore this call.
*
* @api
*/
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void gwinSetText(GHandle gh, const char *text, bool_t useAlloc);
/**
* @brief Get the text of a widget.
* @return The widget text or NULL if it isn't a widget
*
* @param[in] gh The widget handle
*
* @api
*/
const char *gwinGetText(GHandle gh);
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/**
* @brief Set the style of a widget.
*
* @param[in] gh The widget handle
* @param[in] pstyle The style to set. This must be a static structure (not allocated on a transient stack).
* Use NULL to reset to the default style.
*
* @note The widget is automatically redrawn
* @note Non-widgets will ignore this call.
*
* @api
*/
void gwinSetStyle(GHandle gh, const GWidgetStyle *pstyle);
/**
* @brief Get the style of a widget.
* @return The widget style or NULL if it isn't a widget
*
* @param[in] gh The widget handle
*
* @api
*/
const GWidgetStyle *gwinGetStyle(GHandle gh);
/**
* @brief Set the routine to perform a custom widget drawing.
*
* @param[in] gh The widget handle
* @param[in] fn The function to use to draw the widget
* @param[in] param A parameter to pass to the widget drawing function
*
* @note The widget is not automatically redrawn. Call @p gwinDraw() to redraw the widget.
* @note Non-widgets will ignore this call.
*
* @api
*/
void gwinSetCustomDraw(GHandle gh, CustomWidgetDrawFunction fn, void *param);
/**
* @brief Attach a Listener to listen for widget events
* @return TRUE on success
*
* @param[in] pl The listener
*
* @api
*/
bool_t gwinAttachListener(GListener *pl);
#if GFX_USE_GINPUT && GINPUT_NEED_MOUSE
/**
* @brief Set the mouse to be used to control the widgets
* @return TRUE on success
*
* @param[in] instance The mouse instance
*
* @note Every widget uses the same mouse.
*
* @api
*/
bool_t gwinAttachMouse(uint16_t instance);
#endif
#if GFX_USE_GINPUT && GINPUT_NEED_TOGGLE
/**
* @brief Attach a toggle to a widget
* @return TRUE on success
*
* @param[in] gh The widget handle
* @param[in] role The function the toggle will perform for the widget
* @param[in] instance The toggle instance
*
* @note See the documentation on the specific widget to see the possible
* values for the role parameter. If it is out of range, this function
* will return FALSE
*
* @api
*/
bool_t gwinAttachToggle(GHandle gh, uint16_t role, uint16_t instance);
#endif
#if GFX_USE_GINPUT && GINPUT_NEED_DIAL
/**
* @brief Attach a toggle to a widget
* @return TRUE on success
*
* @param[in] gh The widget handle
* @param[in] role The function the dial will perform for the widget
* @param[in] instance The dial instance
*
* @note See the documentation on the specific widget to see the possible
* values for the role parameter. If it is out of range, this function
* will return FALSE
*
* @api
*/
bool_t gwinAttachDial(GHandle gh, uint16_t role, uint16_t instance);
#endif
#ifdef __cplusplus
}
#endif
/* Include extra widget types */
#if GWIN_NEED_BUTTON || defined(__DOXYGEN__)
#include "gwin/button.h"
#endif
#if GWIN_NEED_SLIDER || defined(__DOXYGEN__)
#include "gwin/slider.h"
#endif
#if GWIN_NEED_CHECKBOX || defined(__DOXYGEN__)
#include "gwin/checkbox.h"
#endif
#if GWIN_NEED_RADIO || defined(__DOXYGEN__)
#include "gwin/radio.h"
#endif
#endif /* _GWIDGET_H */
/** @} */