wip text edit GUI (TODO: del/ins in the middle, entering space at the end)

main/scenes/scene_manual_menu.c

@@ -11,7 +11,6 @@
 #include "graphics/display_spec.h"
 
 #include "scenes.h"
-#include "scene_menu.h"
 
 struct Priv {
     int _placeholder;
@@ -35,6 +34,16 @@ static struct SceneEvent onSelect(struct MenuScene *self) {
     else if (self->selected == 2) {
         return SceneEvent_OpenChild(NewScene_PopupTest(), 1);
     }
+    else if (self->selected == 3) {
+        struct StringSceneOpts *opts = calloc(1, sizeof(struct StringSceneOpts));
+        strcpy(opts->value, "");
+        return SceneEvent_OpenChild(NewScene_String(opts), 1);
+    }
+    else if (self->selected == 4) {
+        struct StringSceneOpts *opts = calloc(1, sizeof(struct StringSceneOpts));
+        strcpy(opts->value, "AHOJ");
+        return SceneEvent_OpenChild(NewScene_String(opts), 1);
+    }
 
     return SceneEvent_None();
 }
@@ -65,6 +74,8 @@ void print_labels(struct MenuItem *items) {
     }
 
     strncpy(items[2].label, "▶Item with popup", MENUITEM_LABEL_LEN);
+    strncpy(items[3].label, "▶Empty str", MENUITEM_LABEL_LEN);
+    strncpy(items[4].label, "▶Filled str", MENUITEM_LABEL_LEN);
 }
 
 static void paint(struct MenuScene *self)
@@ -94,11 +105,11 @@ static void paint(struct MenuScene *self)
 }
 
 struct Scene *NewScene_MenuManual() {
-    struct MenuItem *items = calloc(3, sizeof(struct MenuItem));
+    struct MenuItem *items = calloc(5, sizeof(struct MenuItem));
 
     print_labels(items);
     
-    struct MenuScene * scene = NewScene_Menu(items, 3);
+    struct MenuScene * scene = NewScene_Menu(items, 5);
     scene->onSelect = onSelect;
 
     scene->x = XLINE;

main/scenes/scene_string.c

@@ -0,0 +1,209 @@
+#include <malloc.h>
+#include <stdio.h>
+#include <string.h>
+#include <common_utils/utils.h>
+
+#include "liquid.h"
+#include "liquid/input_event.h"
+#include "graphics/drawing.h"
+#include "graphics/display_spec.h"
+#include "scene_string.h"
+
+enum Focus {
+    FOC_CHAR,
+    FOC_CHAR_EDIT,
+    FOC_SUBMIT,
+    FOC_CANCEL,
+};
+
+struct StringScene {
+    struct Scene base;
+    struct StringSceneOpts *opts;
+    int editedchar;
+    int length;
+    enum Focus foc;
+};
+
+// !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
+const char SYMBOLS[] = " ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+
+static void onWheel(struct StringScene *self, struct InputEvent event);
+static struct SceneEvent onButton(struct StringScene *self, struct InputEvent event);
+
+static void ensureCharNotNull(struct StringScene *self);
+static void trimTailSpaces(struct StringScene *self);
+
+static struct SceneEvent onInput(struct StringScene *self, struct InputEvent event) {
+    switch (event.kind) {
+        case InputEventKind_Wheel:
+            onWheel(self, event);
+            return SceneEvent_Repaint();
+        case InputEventKind_Button:
+            return onButton(self, event);
+        default:
+            return SceneEvent_None();
+    }
+}
+
+static struct SceneEvent onButton(struct StringScene *self, struct InputEvent event)
+{
+    if (event.button.state) {
+        switch (self->foc) {
+            case FOC_CHAR:
+                printf("start char edit\n");
+                self->foc = FOC_CHAR_EDIT;
+                ensureCharNotNull(self);
+                return SceneEvent_Repaint();
+
+            case FOC_CHAR_EDIT:
+                if (self->editedchar == self->length) {
+                    printf("submit last char\n");
+
+                    if (self->opts->value[self->editedchar] == ' ') {
+                        printf("empty, go to -> submit\n");
+                        self->foc = FOC_SUBMIT;
+                    }
+                    else {
+                        printf("not empty, advance and keep editing\n");
+                        self->length += 1;
+                        self->editedchar += 1;
+                    }
+                }
+                else {
+                    printf("exit char edit\n");
+                    self->foc = FOC_CHAR;
+                }
+                return SceneEvent_Repaint();
+
+            case FOC_SUBMIT:
+                return SceneEvent_Close(1, NULL); // TODO copy str
+            case FOC_CANCEL:
+                return SceneEvent_Close(0, NULL);
+        }
+    }
+
+    return SceneEvent_None();
+}
+
+static void onWheel(struct StringScene *self, struct InputEvent event)
+{
+    switch (self->foc) {
+        case FOC_CHAR:
+            self->editedchar += event.wheel.direction;
+            printf("Move cursor %d\n", event.wheel.direction);
+
+            if (self->editedchar < 0) {
+                self->editedchar = 0;
+                self->foc = FOC_CANCEL;
+                printf("chars -> cancel\n");
+            }
+            else if (self->editedchar > self->length) {
+                self->editedchar = self->length;
+                self->foc = FOC_SUBMIT;
+                printf("chars -> submit\n");
+            }
+            else {
+                printf("move within chars\n");
+                ensureCharNotNull(self);
+            }
+            trimTailSpaces(self);
+            break;
+
+        case FOC_CHAR_EDIT:;
+            // FIXME this looks buggy
+            const char *pos = strchr(SYMBOLS, self->opts->value[self->editedchar]) + event.wheel.direction;
+            if (pos < SYMBOLS) {
+                pos = SYMBOLS + strlen(SYMBOLS) - 1;
+            } else if (*pos == 0) {
+                pos = SYMBOLS;
+            }
+            self->opts->value[self->editedchar] = *pos;
+            printf("char %d change: %c\n", self->editedchar, *pos);
+            break;
+
+        case FOC_SUBMIT:
+            if (event.wheel.direction > 0) {
+                printf("submit -> cancel\n");
+                self->foc = FOC_CANCEL;
+            } else {
+                printf("submit -> last char\n");
+                self->foc = FOC_CHAR;
+                self->editedchar = self->length;
+            }
+            break;
+
+        case FOC_CANCEL:
+            if (event.wheel.direction > 0) {
+                printf("cancel -> first char\n");
+                self->foc = FOC_CHAR;
+                self->editedchar = 0;
+            } else {
+                printf("cancel -> submit\n");
+                self->foc = FOC_SUBMIT;
+            }
+            break;
+    }
+}
+
+static void paint(struct StringScene *self)
+{
+    struct StringSceneOpts *opts = self->opts;
+    LCD_clearDisplay(0);
+
+    ensureCharNotNull(self);
+
+    LCD_setStrEx(opts->value, 1, 1, BLACK, (struct TextStyle) {
+        .limit = MAX(self->editedchar+1, self->length),
+    });
+
+    if (self->foc == FOC_CHAR) {
+        LCD_setRect(self->editedchar*6, 8, self->editedchar*6+5, 8, false, BLACK);
+    } else if (self->foc == FOC_CHAR_EDIT) {
+        LCD_setRect(self->editedchar*6, 8, self->editedchar*6+5, 9, false, BLACK);
+    }
+
+    LCD_setStrEx("Ok", 50, 15, self->foc == FOC_SUBMIT ? WHITE : BLACK, (struct TextStyle) {.size = FONT_BOLD, .bg=1});
+    LCD_setStrEx("Cancel", 1, 15, self->foc == FOC_CANCEL ? WHITE : BLACK, (struct TextStyle) {.size = FONT_BOLD, .bg=1});
+}
+
+static void ensureCharNotNull(struct StringScene *self)
+{
+    struct StringSceneOpts *opts = self->opts;
+    // ensure there is something to draw
+    if (!opts->value[self->editedchar]) {
+        opts->value[self->editedchar] = ' ';
+    }
+}
+
+static void trimTailSpaces(struct StringScene *self)
+{
+    int pos = self->length;
+    while (pos > 0 && self->opts->value[pos - 1] == ' ') {
+        pos--;
+    }
+    self->length = pos;
+}
+
+static void deinit(struct StringScene *self)
+{
+    free(self->opts);
+    self->opts = NULL;
+}
+
+struct Scene *NewScene_String(struct StringSceneOpts *opts) {
+    struct StringScene *scene = calloc(1, sizeof(struct StringScene));
+    if (!scene) return NULL;
+
+    scene->opts = opts;
+    scene->base.onInput = (Scene_onInput_t) onInput;
+    scene->base.paint = (Scene_paint_t) paint;
+    scene->base.deinit = (Scene_deinit_t) deinit;
+
+    scene->length = strlen(opts->value);
+    scene->foc = scene->length==0? FOC_CHAR_EDIT : FOC_CHAR;
+    scene->editedchar = 0;
+
+    ensureCharNotNull(scene);
+
+    return (struct Scene *) scene;
+}

main/scenes/scene_string.h

@@ -0,0 +1,35 @@
+/**
+ * TODO file description
+ * 
+ * Created on 2020/01/05.
+ */
+
+#ifndef REFLOWER_SCENE_STR_H
+#define REFLOWER_SCENE_STR_H
+
+#include <stdint.h>
+
+#define STR_EDIT_VALUE_MAXLEN 17
+
+/**
+ * Options passed to the StringScene constructor
+ */
+struct StringSceneOpts {
+    // Screen title
+    char label[15];
+    // Value
+    char value[STR_EDIT_VALUE_MAXLEN];
+};
+
+/**
+ * Create string picker.
+ *
+ * "opts" must be on heap and will be internally mutated.
+ * The scene frees them on exit, returning the selected value as data (heap string), or NULL on cancel.
+ *
+ * @param opts
+ * @return
+ */
+struct Scene *NewScene_String(struct StringSceneOpts *opts);
+
+#endif //REFLOWER_SCENE_STR_H

main/scenes/scenes.h

@@ -17,6 +17,7 @@ struct Scene *NewScene_PopupTest();
 
 #include "scene_menu.h"
 #include "scene_number.h"
+#include "scene_string.h"
 
 struct MenuScene *NewScene_PopupMenu(struct MenuItem *items, size_t items_len);