initial commit

NewDialogs/Scrollbar.cpp

@@ -0,0 +1,103 @@
+#include "Scrollbar.h"
+
+Scrollbar::Scrollbar(int min_value, int max_value, int value, SDL_Rect pos) : Item(pos) {
+    vertical = (pos.h > pos.w);
+    this->min_value = min_value;
+    this->max_value = max_value;
+    this->value = value;
+    bar_size = 18;
+    pressed = false;
+    value_changed_func = NULL;
+    setSurface(SDL_CreateSurface(getPos()->w, getPos()->h, SDL_GetPixelFormatForMasks(32, 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000)));
+    drawScrollbar();
+}
+
+Scrollbar::~Scrollbar() {
+    SDL_DestroySurface(getSurface());
+}
+
+void Scrollbar::drawScrollbar() {
+    SDL_Surface *surface = getSurface();
+    int w = getPos()->w;
+    int h = getPos()->h;
+
+    Uint32 *p = (Uint32 *) surface->pixels;
+    SDL_Color color;
+    for (int y = 0; y < h; y++) {
+        for (int x = 0; x < w; x++) {
+            int x_or_y = (vertical ? y : x);
+            bool bar_pos_test = (x_or_y > getBarPos() && x_or_y < getBarPos() + bar_size);
+
+            if (y == 0 || y == h-1 || x == 0 || x == w-1 || bar_pos_test) {
+                color.r = 0;
+                color.g = 0;
+                color.b = 0;
+            } else {
+                color.r = 255;
+                color.g = 255;
+                color.b = 255;
+            }
+            *p = SDL_MapRGB(SDL_GetPixelFormatDetails(surface->format), NULL, color.r, color.g, color.b);
+            p++;
+        }
+    }
+}
+
+bool Scrollbar::onMousePress(int x, int y) {
+    bool is_in_x = x > getPos()->x && x < getPos()->x + getPos()->w;
+    bool is_in_y = y > getPos()->y && y < getPos()->y + getPos()->h;
+    if (is_in_x && is_in_y) {
+        //setSurface(buttonDown);
+        mouse_offset = (vertical ? y : x) - getBarPos();
+        pressed = true;
+        return true;
+    }
+    return false;
+}
+
+void Scrollbar::onMouseRelease(int x, int y) {
+    //bool is_in_x = x > getPos()->x && x < getPos()->x + getPos()->w;
+    //bool is_in_y = y > getPos()->y && y < getPos()->y + getPos()->h;
+    //if (is_in_x && is_in_y && pressed) {
+    if (pressed) {
+        setValueByBarPos((vertical ? y : x) - mouse_offset);
+        drawScrollbar();
+        if (value_changed_func) {
+            (*value_changed_func)(p);
+        }
+    }
+    //setSurface(buttonUp);
+    pressed = false;
+}
+
+void Scrollbar::onMouseMove(int x, int y) {
+    if (pressed) {
+        setValueByBarPos((vertical ? y : x) - mouse_offset);
+        drawScrollbar();
+        if (value_changed_func)
+            (*value_changed_func)(p);
+    }
+}
+
+int Scrollbar::getBarPos() {
+    int w_or_h = (vertical ? getPos()->h : getPos()->w);
+    return (w_or_h - bar_size) * (value - min_value) / (max_value - min_value);
+}
+
+void Scrollbar::setValueByBarPos(int pos) {
+    int w_or_h = (vertical ? getPos()->h : getPos()->w);
+    value = (max_value - min_value) * pos / (w_or_h - bar_size) + min_value;
+    if (value < min_value)
+        value = min_value;
+    if (value > max_value)
+        value = max_value;
+}
+
+void Scrollbar::setValueChangedFunc(void (*value_changed_func)(void *p), void *p) {
+    this->value_changed_func = value_changed_func;
+    this->p = p;
+}
+
+int Scrollbar::getValue() {
+    return value;
+}