292 lines
9.0 KiB
C
292 lines
9.0 KiB
C
/*
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* This file is subject to the terms of the GFX License. If a copy of
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* the license was not distributed with this file, you can obtain one at:
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*
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* http://ugfx.org/license.html
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*/
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/**
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* @file include/gwin/list.h
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* @brief GWIN list widget header file
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*
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* @defgroup List List
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* @ingroup GWIN
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*
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* @details GWIN allows it to create a list widget.
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*
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* @pre GFX_USE_GDISP must be set to TRUE in your gfxconf.h
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* @pre GFX_USE_GWIN must be set to TRUE in your gfxconf.h
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* @pre GDISP_NEED_TEXT must be set to TRUE in your gfxconf.h
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* @pre GWIN_NEED_LIST must be set to TRUE in your gfxconf.h
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* @pre The font you want to use must be enabled in your gfxconf.h
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*
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* @{
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*/
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#ifndef _GWIN_LIST_H
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#define _GWIN_LIST_H
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// This file is included within "gwin/gwin.h"
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/**
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* @brief The event type for a list event
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*/
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#define GEVENT_GWIN_LIST (GEVENT_GWIN_FIRST+4)
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/**
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* @brief A list event
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*/
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typedef struct GEventGWinList {
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GEventType type; // The type of this event (GEVENT_GWIN_LIST)
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GHandle list; // The list
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int item; // The item that has been selected (or unselected in a multi-select listbox)
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} GEventGWinList;
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// A list window
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typedef struct GListObject {
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GWidgetObject w;
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#if GINPUT_NEED_TOGGLE
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uint16_t t_up;
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uint16_t t_dn;
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#endif
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int cnt; // Number of items currently in the list (quicker than counting each time)
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int top; // The element at the top of the visible list area
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gfxQueueASync list_head; // The list of items
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} GListObject;
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/**
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* @brief Enum to change the behaviour of the scroll bar
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*
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* @note This might be used with @p gwinListSetScroll()
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*/
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typedef enum scroll_t { scrollAlways, scrollAuto } scroll_t;
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Create a list widget
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*
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* @note The drawing color and the background color get set to the current defaults. If you haven't called
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* @p gwinSetDefaultColor() or @p gwinSetDefaultBgColor() then these are Black and White.
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* @note The font gets set to the current default font. If you haven't called @p gwinSetDefaultFont() then
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* there is no default font and text drawing operations will not display anything.
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* @note A list remembers its normal drawing state. If there is a window manager then it is automatically
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* redrawn if the window is moved or its visibility state is changed.
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* @note The list contains no elements after creation.
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* @note A slider supports mouse, toggle. Note: toggle only works correctly for single-select lists.
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* @note When assigning a toggle, only one toggle is supported per role. If you try to assign more than
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* one toggle to a role, it will forget the previous toggle. Two roles are supported:
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* Role 0 = toggle for down, role 1 = toggle for up
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*
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* @param[in] g The GDisplay to display this window on
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* @param[in] widget The GListObject structure to initialize. If this is NULL, the structure is dynamically allocated.
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* @param[in] pInit The initialization parameters to use
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* @param[in] multiselect If TRUE the list is multi-select instead of single-select.
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*
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* @return NULL if there is no resulting drawing area, otherwise a window handle.
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*
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* @api
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*/
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GHandle gwinGListCreate(GDisplay *g, GListObject *widget, GWidgetInit *pInit, bool_t multiselect);
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#define gwinListCreate(w, pInit, m) gwinGListCreate(GDISP, w, pInit, m)
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/**
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* @brief Change the behaviour of the scroll bar
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*
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* @note Current possible values: @p scrollAlways and @p scrollAuto
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*
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* @param[in] gh The widget handle (must be a list handle)
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* @param[in] flag The behaviour to be set
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*
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* @api
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*/
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void gwinListSetScroll(GHandle gh, scroll_t flag);
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/**
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* @brief Change the behaviour of the scroll bar
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*
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* @note Current possible values: @p scrollAlways and @p scrollAuto
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*
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* @param[in] gh The widget handle (must be a list handle)
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* @param[in] flag The behaviour to be set
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*
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* @api
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*/
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void gwinListSetScroll(GHandle gh, scroll_t flag);
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/**
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* @brief Add an item to the list
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*
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* @note The ID you get returned is not static. If items get removed from the list, the list items get
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* reordered.
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*
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* @param[in] gh The widget handle (must be a list handle)
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* @param[in] item The string which shall be displayed in the list afterwards
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* @param[in] useAlloc If set to TRUE, the string will be dynamically allocated. A static buffer must be passed otherwise
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*
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* @return The current ID of the item. The ID might change if you remove items from the middle of the list
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*
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* @api
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*/
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int gwinListAddItem(GHandle gh, const char* item, bool_t useAlloc);
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/**
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* @brief Get the name behind an item with a given ID
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*
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* @param[in] gh The widget handle (must be a list handle)
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* @param[in] item The item ID
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*
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* @return The string of the list item or NULL on error
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*
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* @api
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*/
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const char* gwinListItemGetText(GHandle gh, int item);
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/**
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* @brief Get the ID of an item with a given name
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*
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* @param[in] gh The widget handle (must be a list handle)
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* @param[in] text The item name
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*
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* @return The id of the list item or -1 on error
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*
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* @api
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*/
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int gwinListFindText(GHandle gh, const char* text);
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/**
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* @brief Set the custom parameter of an item with a given ID
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*
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* @param[in] gh The widget handle (must be a list handle)
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* @param[in] item The item ID
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* @param[in] param The parameter to be set
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*
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* @api
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*/
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void gwinListItemSetParam(GHandle gh, int item, uint16_t param);
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/**
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* @brief Get the custom parameter of an item with a given ID
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*
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* @param[in] gh The widget handle (must be a list handle)
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* @param[in] item The item ID
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*
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* @return The parameter
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*
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* @api
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*/
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uint16_t gwinListItemGetParam(GHandle gh, int item);
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/**
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* @brief Delete all the items of the list
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*
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* @param[in] gh The widget handle (must be a list handle)
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*
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* @api
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*/
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void gwinListDeleteAll(GHandle gh);
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/**
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* @brief Delete an item from the list
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*
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* @param[in] gh The widget handle (must be a list handle)
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* @param[in] item The item ID
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*
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* @api
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*/
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void gwinListItemDelete(GHandle gh, int item);
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/**
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* @brief Get the amount of items within the list
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*
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* @param[in] gh The widget handle (must be a list handle)
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*
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* @return The amount of items in the list
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*
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* @api
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*/
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int gwinListItemCount(GHandle gh);
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/**
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* @brief Check if an item with a given ID is selected
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*
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* @param[in] gh The widget handle (must be a list handle)
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* @param[in] item The item ID
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*
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* @return TRUE if the item is selected, FALSE otherwise
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*
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* @api
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*/
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bool_t gwinListItemIsSelected(GHandle gh, int item);
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/**
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* @brief Get the ID of the selected item
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*
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* @param[in] gh The widget handle (must be a list handle)
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*
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* @return The ID of the selected list item for a single-select list.
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*
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* @note It always returns -1 (nothing selected) for a multi-select list.
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* Instead use @p gwinListItemIsSelected() to get the selection status
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* for a multi-select list.
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*
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* @api
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*/
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int gwinListGetSelected(GHandle gh);
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/**
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* @brief Get the text of the selected item
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*
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* @param[in] gh The widget handle (must be a list handle)
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*
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* @return The test of the selected list item for a single-select list.
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*
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* @note It always returns NULL (nothing selected) for a multi-select list.
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*
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* @api
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*/
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const char* gwinListGetSelectedText(GHandle gh);
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#if GWIN_NEED_LIST_IMAGES || defined(__DOXYGEN__)
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/**
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* @brief Set the image for a list item
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*
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* @pre GWIN_NEED_LIST_IMAGES must be set to true in your gfxconf.h
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*
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* @param[in] gh The widget handle (must be a list handle)
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* @param[in] item The item ID
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* @param[in] pimg The image to be displayed or NULL to turn off the image for this list item.
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*
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* @note The image should be up to 4 x (the font height) and a width of (the font height).
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* The 1st (top) part of the image is displayed for a selected item.
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* The 2nd part of the image is displayed for an unselected item.
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* The 3rd part of the image is displayed for a disabled selected item.
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* The 4th part of the image is displayed for a disabled unselected item.
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* If the image is less than 4 times the font height then the image use is collapsed
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* into the available height. For example, an image that equals the font height will use
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* the same image for all four states.
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* @note The image is only displayed while it is open. It is up to the application to open
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* the image.
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* @note The same image can be used on more than one list item.
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* @note Images are aligned with the top (not the baseline) of the list item.
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* @note When any item in the list has an image attached, space is allocated to display
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* the images even if the image is closed or has been removed by calling @p gwinListItemSetImage()
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* with a NULL image or by calling @p gwinListItemDelete(). The only way to turn-off the image area
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* for this list is to call gwinListDeleteAll().
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*
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*/
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void gwinListItemSetImage(GHandle gh, int item, gdispImage *pimg);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif // _GWIN_LIST_H
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/** @} */
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