Element.cpp

#include "RootDisplay.hpp"
#include <algorithm>
#include "Constraint.hpp"
#include "Animation.hpp"
#include <string>
 
Element::~Element()
{
    removeAll();
}
 
Element::Element()
{
    needsRedraw = true;
}
 
bool Element::process(InputEvents* event)
{
    // whether or not we need to update the screen
    bool ret = false;
 
    // if we're hidden, don't process input
    if (hidden) return ret;
 
    // if 3ds mock, ignore top screen inputs
#ifdef _3DS_MOCK
    if (event->touchIn(0, 0, 400, 240)) return ret;
#endif
 
    // do any touch down, drag, or up events
    if (touchable)
    {
        ret |= onTouchDown(event);
        ret |= onTouchDrag(event);
        ret |= onTouchUp(event);
    }
 
    // call process on subelements
    for (int x = 0; x < this->elements.size(); x++)
        if (this->elements.size() > x && this->elements[x])
            ret |= this->elements[x]->process(event);
 
    ret |= this->needsRedraw;
    this->needsRedraw = false;
 
    // if this variable is positive, decrease it, and force a redraw (acts like needsRedraw but over X redraws)
    if (futureRedrawCounter > 0) {
        futureRedrawCounter --;
        ret |= true;
    }
 
    if (RootDisplay::idleCursorPulsing) {
        // if we are using idle cursor pulsing, and this element's elastic counter is 0, force a redraw
        return ret | (this->elasticCounter > 0);
    }
 
    return ret;
}
 
void Element::render(Element* parent)
{
    //if we're hidden, don't render
    if (hidden) return;
 
    // this needs to happen before any rendering
    this->recalcPosition(parent);
 
    // if we're in debug mode, draw an outline
    if (this->hasBackground) {
        // render the element background
        this->renderBackground(true);
    }
    else if (RootDisplay::isDebug) {
        backgroundColor = randomColor();
        this->renderBackground(false);
    }
 
    // go through every subelement and run render
    for (Element* subelement : elements)
    {
        subelement->render(this);
    }
 
    CST_Renderer* renderer = getRenderer();
 
    // if we're touchable, and we have some animation counter left, draw a rectangle+overlay
    if (this->touchable && this->elasticCounter > THICK_HIGHLIGHT)
    {
        CST_Rect d = { this->xAbs - 5, this->yAbs - 5, this->width + 10, this->height + 10 };
        CST_SetDrawBlend(renderer, true);
        CST_SetDrawColorRGBA(renderer, 0x10, 0xD9, 0xD9, 0x40);
        CST_FillRect(renderer, &d);
    }
 
    if (this->touchable && this->elasticCounter > NO_HIGHLIGHT)
    {
        CST_Rect d = { this->xAbs - 5, this->yAbs - 5, this->width + 10, this->height + 10 };
        if (this->elasticCounter == THICK_HIGHLIGHT)
        {
            int ticks = CST_GetTicks() / 100;
            int pulseState = ticks % 20;
            if (pulseState > 9) {
                pulseState = 19 - pulseState;
            }
 
            if (!RootDisplay::idleCursorPulsing) {
                // if we're not using idle cursor pulsing, just draw a simple rectangle
                pulseState = 0;
            }
 
            // make it a little thicker by drawing more rectangles TODO: better way to do this?
            for (int x = -2; x <= 3; x++)
            {
                // draw a rectangle with varying brightness depending on the pulse state
                int r = 0x10; //- 0x01 * pulseState;
                int g = 0xD9 - 0x01 * pulseState;
                int b = 0xD9 - 0x01 * pulseState;
                int edgeMod = x==1 ? 0 : abs(x); // slight bias towards the inner
                int a = fmax(0x0, 0xFF - 0x10 * pulseState * edgeMod);
                CST_rectangleRGBA(renderer, d.x + x, d.y + x, d.x + d.w - x, d.y + d.h - x, r, g, b, a);
            }
        } else {
            // simple rectangle, not pulsing
            CST_rectangleRGBA(renderer, d.x, d.y, d.x + d.w, d.y + d.h, 0x10, 0xD9, 0xD9, 0xFF);
            // and one inner rectangle too
            CST_rectangleRGBA(renderer, d.x + 1, d.y + 1, d.x + d.w - 1, d.y + d.h - 1, 0x10, 0xD9, 0xD9, 0xFF);
        }
    }
}
 
void Element::recalcPosition(Element* parent) {
    // calculate absolute x/y positions
    if (parent && !isAbsolute)
    {
        this->xAbs = parent->xAbs + this->x;
        this->yAbs = parent->yAbs + this->y;
    } else {
        this->xAbs = this->x;
        this->yAbs = this->y;
    }
 
    // go through all constraints and apply them
    for (Constraint* constraint : constraints)
    {
        constraint->apply(this);
    }
 
    // go through all animations and apply them
    // TODO: animations can modify the actual positions, which can mess up constraints
    if (animations.size() > 0) {
        std::vector<Animation*> toRemove;
        for (Animation* animation : animations)
        {
            // if there are any animations, we need to re-render
            needsRedraw = true;
 
            bool finished = animation->step();
            if (finished) {
                toRemove.push_back(animation);
            }
        }
        for (Animation* animation : toRemove) {
            animations.erase(std::remove(animations.begin(), animations.end(), animation), animations.end());
            delete animation;
        }
    }
}
 
CST_Rect Element::getBounds()
{
    return {
        .x = this->xAbs,
        .y = this->yAbs,
        .w = this->width,
        .h = this->height,
    };
}
 
void Element::renderBackground(bool fill) {
    CST_Renderer* renderer = getRenderer();
    CST_Rect bounds = getBounds();
    CST_SetDrawColorRGBA(renderer,
        static_cast<Uint8>(backgroundColor.r * 0xFF),
        static_cast<Uint8>(backgroundColor.g * 0xFF),
        static_cast<Uint8>(backgroundColor.b * 0xFF),
        0xFF
    );
    CST_SetDrawBlend(renderer, false);
    const auto RenderRect = fill ? CST_FillRect : CST_DrawRect;
    RenderRect(renderer, &bounds);
}
 
void Element::position(int x, int y)
{
    this->x = x;
    this->y = y;
}
 
bool Element::onTouchDown(InputEvents* event)
{
    if (!event->isTouchDown())
        return false;
 
    if (!event->touchIn(this->xAbs, this->yAbs, this->width, this->height))
        return false;
 
    // mouse pushed down, set variable
    this->dragging = true;
    this->lastMouseY = event->yPos;
    this->lastMouseX = event->xPos;
 
    // turn on deep highlighting during a touch down
    if (this->touchable)
        this->elasticCounter = DEEP_HIGHLIGHT;
 
    return true;
}
 
bool Element::onTouchDrag(InputEvents* event)
{
    bool ret = false;
 
    if (!event->isTouchDrag())
        return false;
 
    // if we're not in a deeplight (a touchdown event), draw our own drag highlight
    if (this->elasticCounter != DEEP_HIGHLIGHT) {
        if (event->touchIn(this->xAbs, this->yAbs, this->width, this->height)) {
            // if there's currently _no_ highlight, and we're in a drag event on this element,
            // so we should turn on the hover highlight
            this->elasticCounter = THICK_HIGHLIGHT;
            ret |= true;
 
            // play a hover sound and vibrate
            CST_LowRumble(event, 200);
 
            // change the cursor to a hand
            CST_SetCursor(CST_CURSOR_HAND);
        } else {
            auto initialElasticCounter = this->elasticCounter;
 
            // we're in a drag event, but not for this element
            this->elasticCounter = NO_HIGHLIGHT;
 
            if (initialElasticCounter != NO_HIGHLIGHT) {
                // change the cursor back to the arrow
                CST_SetCursor(CST_CURSOR_ARROW);
                ret |= true;
            }
 
        }
    }
 
    // minimum amount of wiggle allowed by finger before calling off a touch event
    int TRESHOLD = 40 / SCALER / SCALER;
 
    // we've dragged out of the icon, invalidate the click by invoking onTouchUp early
    // check if we haven't drifted too far from the starting variable (treshold: 40)
    if (this->dragging && (abs(event->yPos - this->lastMouseY) >= TRESHOLD || abs(event->xPos - this->lastMouseX) >= TRESHOLD))
    {
        ret |= (this->elasticCounter > 0);
        auto prevElasticCounter = this->elasticCounter;
        this->elasticCounter = NO_HIGHLIGHT;
        if (prevElasticCounter != NO_HIGHLIGHT) {
            // change the cursor back to the arrow
            CST_SetCursor(CST_CURSOR_ARROW);
        }
    }
 
    return ret;
}
 
bool Element::onTouchUp(InputEvents* event)
{
    if (!event->isTouchUp())
        return false;
 
    bool ret = false;
 
    // ensure we were dragging first (originally checked the treshold above here, but now that actively invalidates it)
    if (this->dragging)
    {
        // check that this click is in the right coordinates for this square
        // and that a subscreen isn't already being shown
        // TODO: allow buttons to activae this too?
        if (event->touchIn(this->xAbs, this->yAbs, this->width, this->height))
        {
            // elasticCounter must be nonzero to allow a click through (highlight must be shown)
            if (this->elasticCounter > 0)
            {
                // invoke this element's action
                if (action != NULL) {
                    this->action();
                    ret |= true;
                }
                if (actionWithEvents != NULL) {
                    this->actionWithEvents(event);
                    ret |= true;
                }
            }
        }
    }
 
    // release mouse
    this->dragging = false;
 
    // update if we were previously highlighted, cause we're about to remove it
    ret |= (this->elasticCounter > 0);
 
    this->elasticCounter = 0;
 
    return ret;
}
 
void Element::append(Element *element)
{
    auto position = std::find(elements.begin(), elements.end(), element);
    if (position == elements.end()) {
        elements.push_back(element);
    }
}
 
void Element::remove(Element *element)
{
    auto position = std::find(elements.begin(), elements.end(), element);
    if (position != elements.end())
        elements.erase(position);
}
 
void Element::wipeAll(bool delSelf)
{
    // delete's this element's children, then itself
    for (auto child : elements) {
        child->wipeAll(true);
    }
    elements.clear();
 
    if (delSelf && !isProtected) {
        delete this;
    }
}
 
void Element::removeAll(bool moveToTrash)
{
    if (moveToTrash) {
        // store in a list for free-ing up memory later
        for (auto e : elements) {
            RootDisplay::mainDisplay->trash.push_back(e);
        }
    }
    elements.clear();
    constraints.clear(); // remove all constraints too
    animations.clear();
}
 
Element* Element::child(Element* child)
{
    this->elements.push_back(child);
    child->parent = this;
    child->recalcPosition(this);
    return this;
}
 
Element* Element::setPosition(int x, int y)
{
    this->position(x, y);
    return this;
}
 
Element* Element::setAction(std::function<void()> func)
{
    this->action = func;
    return this;
}
 
Element* Element::centerHorizontallyIn(Element* parent)
{
    this->x = parent->width / 2 - this->width / 2;
    return this;
}
 
Element* Element::centerVerticallyIn(Element* parent)
{
    this->y = parent->height / 2 - this->height / 2;
    return this;
}
 
Element* Element::centerIn(Element* parent)
{
    return centerHorizontallyIn(parent)->centerVerticallyIn(parent);
}
 
Element* Element::setAbsolute(bool isAbs)
{
    isAbsolute = isAbs;
    return this;
}
 
CST_Renderer* Element::getRenderer() {
    return RootDisplay::renderer;
}
 
Element* Element::constrain(int flags, int padding)
{
    constraints.push_back(new Constraint(flags, padding));
    return this;
}
 
Element* Element::animate(
    int duration,
    std::function<void(float)> onStep,
    std::function<void()> onFinish
) {
    animations.push_back(new Animation(
        CST_GetTicks(), duration, onStep, onFinish)
    );
 
    return this;
}
 
// Move an element up within its parent
Element* Element::moveToFront() {
    if (parent != NULL) {
        parent->remove(this);
        parent->child(this);
    }
    return this;
}
 
Element* Element::setTouchable(bool touchable)
{
    this->touchable = touchable;
    return this;
}
 
void Element::screenshot(std::string path) {
    // render the webview to a target that can be saved (TARGET ACCESS)
    CST_Texture* target = SDL_CreateTexture(getRenderer(), SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET, width, height);
 
    // set the target texture
    SDL_SetRenderTarget(getRenderer(), target);
 
    // draw a white background first
    SDL_SetRenderDrawColor(getRenderer(), 255, 255, 255, 255);
    SDL_RenderClear(getRenderer());
 
    // render the texture
    render(parent);
 
    // reset the target texture
    SDL_SetRenderTarget(getRenderer(), NULL);
 
    // save the surface to the path
    CST_SavePNG(target, path.c_str());
}