134 lines
2.4 KiB
C++
134 lines
2.4 KiB
C++
#ifndef UI_ELEMENT_H
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#define UI_ELEMENT_H
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#include "UIStructs.h"
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#include "UIPainter.h"
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#undef min
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#undef max
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#include <vector>
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class UIElement {
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protected:
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UIRect rect;
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bool _visible = true;
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bool _needsRedraw = true;
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bool opaque = true;
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bool focus = false;
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std::vector<UIElement*> children;
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static constexpr const char* TAG = "UIElement";
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public:
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void setOpaque(bool opaque) {
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this->opaque = opaque;
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}
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void setRect(const UIRect r) {
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this->rect = r;
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setNeedsRedraw();
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reLayout();
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}
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void setRect(const uint16_t x, const uint16_t y, const uint16_t w, const uint16_t h) {
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this->rect = UIRect(x,y,w,h);
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setNeedsRedraw();
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reLayout();
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}
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const UIRect& getRect() const {
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return rect;
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}
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void setVisible(bool visible) {
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this->_visible = visible;
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setNeedsRedraw();
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}
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bool isVisible() const {
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return this->_visible;
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}
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void setFocus(bool focus) {
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this->focus = focus;
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setNeedsRedraw();
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}
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void setNeedsRedraw() {
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this->_needsRedraw = true;
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}
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bool needsRedraw() const {
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return this->_needsRedraw;
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}
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void addChild(UIElement* e) {
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children.push_back(e);
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}
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protected:
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friend class UI;
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virtual void draw(UIPainter& p) {;}
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/** layout needs updating */
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virtual void reLayout() {;}
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virtual void onTouchDown(uint16_t, uint16_t) {;} // relative (x,y) coordinate
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virtual void onTouch(uint16_t, uint16_t) {;} // relative (x,y) coordinate
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virtual void onTouchUp() {;}
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protected:
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UIElement* _onTouch(const uint16_t x, const uint16_t y) {
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// if i'm invisible, ignore for me and children
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if (!isVisible()) {return nullptr;}
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// touch outside of me, ignore for me and children
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if (!getRect().contains(x,y)) {return nullptr;}
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// find first child that takes the event
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for (UIElement* e : children) {
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UIElement* taken = e->_onTouch(x, y);
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if (taken) {return taken;}
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}
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// take the event myself
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const uint16_t x1 = x - getRect().x; // (x,y) relative to elements top-left
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const uint16_t y1 = y - getRect().y;
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debugMod2(TAG, "onTouchDown(%d,%d)", x1, y1);
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onTouchDown(x1, y1);
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return this;
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}
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void _draw(UIPainter& p) {
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// if hiden, ignore for me and children
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if (!_visible) {return;}
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// draw myself (if needed)
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if (_needsRedraw) {
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draw(p);
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_needsRedraw = false;
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}
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// call for children as well
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for (UIElement* child : children) {
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child->_draw(p);
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}
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}
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};
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#endif // UI_ELEMENT_H
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