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Diffstat (limited to 'include/gwin/gwidget.h')
| -rw-r--r-- | include/gwin/gwidget.h | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/include/gwin/gwidget.h b/include/gwin/gwidget.h new file mode 100644 index 00000000..50f19193 --- /dev/null +++ b/include/gwin/gwidget.h @@ -0,0 +1,213 @@ +/* + * 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: + * + * http://chibios-gfx.com/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 must be set to TRUE in your gfxconf.h + * @{ + */ + +// Forward definition +struct GWidgetObject; + +/** + * @brief Defines a custom drawing function for a widget + */ +typedef void (*CustomWidgetDrawFunction)(struct GWidgetObject *gw, void *param); + +/** + * @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 you 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 * txt; // @< The widget text + CustomWidgetDrawFunction fnDraw; // @< The current draw function + void * fnParam; // @< A parameter for the current draw function +} GWidgetObject; +/* @} */ + +/** + * @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 { + GWindowInit g; // @< The GWIN initializer + const char * text; // @< The initial text +} GWidgetInit; +/* @} */ + +/** + * 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 + +/** + * @brief Enable or disable a widget + * + * @param[in] gh The widget handle + * @param[in] enabled Enable or disable the widget + * + * @note The widget is automatically redrawn. + * @note Non-widgets will ignore this call. + * + * @api + */ +void gwinSetEnabled(GHandle gh, bool_t enabled); + +/** + * @brief Set the text of a widget. + * + * @param[in] gh The widget handle + * @param[in] txt 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 + */ +void gwinSetText(GHandle gh, const char *txt, 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); + +/** + * @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 + +#endif /* _GWIDGET_H */ +/** @} */ |