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