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83 lines
1.9 KiB
83 lines
1.9 KiB
/**
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* Scrollable menu
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*
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* Created on 2020/01/05.
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*/
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#ifndef REFLOWER_SCENE_MENU_H
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#define REFLOWER_SCENE_MENU_H
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#include <stdint.h>
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#include <stdbool.h>
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#include <stddef.h>
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#define MENUITEM_LABEL_LEN 30
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/**
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* One item of the menu
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*/
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struct MenuItem {
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// menu label
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char label[MENUITEM_LABEL_LEN];
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// item tag (useful with dynamically generated menus)
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uint32_t tag;
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};
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struct MenuScene;
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/**
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* Selection handler.
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*
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* When an item is selected, this abstract method is fired to determine what should happen.
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*
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* The selected item is available as scene.selected.
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* Return SceneEvent to take, e.g. to close the menu, or to open a sub-scene.
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*/
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typedef struct SceneEvent (*MenuScene_onSelect_t)(struct MenuScene *scene);
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struct MenuScene {
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struct Scene base;
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// items array
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struct MenuItem *items;
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// allow wrap-around
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bool wraparound;
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// items count
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size_t items_len;
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// Vertical scroll offset (how many steps is the topmost item moved above the screen)
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int32_t scroll_up;
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// Start X
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int x;
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// Start Y
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int y;
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// Selected item number
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int32_t selected;
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// Horizontal scroll count
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int32_t hscroll;
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// Horizontal scroll timer
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int32_t hscroll_cnt;
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// Number of lines visible at a time
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uint8_t nlines;
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// number of visible characters in a line at a time
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uint8_t ncols;
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// selection handler
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MenuScene_onSelect_t onSelect;
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// Extra field for the subclass's private use.
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void *extra;
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// fp for extra's deinit function
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Scene_deinit_t extra_deinit;
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};
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/**
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* Create a new items menu.
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*
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* This is normally called from a subclass.
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*
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* @param items - menu items on heap (the MenuScene will free them on close)
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* @param items_len - item count
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* @return the menu
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*/
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struct MenuScene *NewScene_Menu(struct MenuItem *items, size_t items_len);
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void MenuScene_Paint(struct MenuScene *self);
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#endif //REFLOWER_SCENE_MENU_H
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