android_bootable_recovery/gui/slider.cpp

// slider.cpp - GUISlider object
// Pulled & ported from https://raw.github.com/agrabren/RecoverWin/master/gui/slider.cpp

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/reboot.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <time.h>
#include <unistd.h>
#include <stdlib.h>

#include <string>

extern "C" {
#include "../twcommon.h"
#include "../minuitwrp/minui.h"
}

#include "rapidxml.hpp"
#include "objects.hpp"

GUISlider::GUISlider(xml_node<>* node)
{
    xml_attribute<>* attr;
    xml_node<>* child;

    sAction = NULL;
    sSlider = NULL;
    sSliderUsed = NULL;
    sTouch = NULL;
    sTouchW = 20;

    if (!node)
    {
        LOGERR("GUISlider created without XML node\n");
        return;
    }

    child = node->first_node("resource");
    if (child)
    {
        attr = child->first_attribute("base");
        if (attr)
            sSlider = PageManager::FindResource(attr->value());

        attr = child->first_attribute("used");
        if (attr)
            sSliderUsed = PageManager::FindResource(attr->value());

        attr = child->first_attribute("touch");
        if (attr)
            sTouch = PageManager::FindResource(attr->value());
    }

    // Load the placement
	LoadPlacement(node->first_node("placement"), &mRenderX, &mRenderY);

    if (sSlider && sSlider->GetResource())
    {
		mRenderW = gr_get_width(sSlider->GetResource());
        mRenderH = gr_get_height(sSlider->GetResource());
    }
    if (sTouch && sTouch->GetResource())
    {
        sTouchW = gr_get_width(sTouch->GetResource());  // Width of the "touch image" that follows the touch (arrow)
        sTouchH = gr_get_height(sTouch->GetResource()); // Height of the "touch image" that follows the touch (arrow)
    }

    //LOGINFO("mRenderW: %i mTouchW: %i\n", mRenderW, mTouchW);
	mActionX = mRenderX;
    mActionY = mRenderY;
    mActionW = mRenderW;
    mActionH = mRenderH;

    sAction = new GUIAction(node);

    sCurTouchX = mRenderX;
    sUpdate = 1;

    return;
}

GUISlider::~GUISlider()
{
    delete sAction;
}

int GUISlider::Render(void)
{
    if (!sSlider || !sSlider->GetResource())       return -1;

    // Draw the slider
    gr_blit(sSlider->GetResource(), 0, 0, mRenderW, mRenderH, mRenderX, mRenderY);

    // Draw the used
    if (sSliderUsed && sSliderUsed->GetResource() && sCurTouchX > mRenderX)
    {
        gr_blit(sSliderUsed->GetResource(), 0, 0, sCurTouchX - mRenderX, mRenderH, mRenderX, mRenderY);
    }

    // Draw the touch icon
    if (sTouch && sTouch->GetResource())
    {
        gr_blit(sTouch->GetResource(), 0, 0, sTouchW, sTouchH, sCurTouchX, (mRenderY + ((mRenderH - sTouchH) / 2)));
    }

    sUpdate = 0;
    return 0;
}

int GUISlider::Update(void)
{
    if (sUpdate)    return 2;
    return 0;
}

int GUISlider::NotifyTouch(TOUCH_STATE state, int x, int y)
{
    static bool dragging = false;

	switch (state)
    {
    case TOUCH_START:
        if (x >= mRenderX && x <= mRenderX + sTouchW && 
            y >= mRenderY && y <= mRenderY + mRenderH)
        {
            sCurTouchX = x - (sTouchW / 2);
            if (sCurTouchX < mRenderX)  sCurTouchX = mRenderX;
            dragging = true;
        }
        break;

    case TOUCH_DRAG:
        if (!dragging)  return 0;
        if (y < mRenderY - sTouchH || y > mRenderY + (sTouchH * 2))
        {
            sCurTouchX = mRenderX;
            dragging = false;
            sUpdate = 1;
            break;
        }
        sCurTouchX = x - (sTouchW / 2);
        if (sCurTouchX < mRenderX)                          sCurTouchX = mRenderX;
        if (sCurTouchX > mRenderX + mRenderW - sTouchW)     sCurTouchX = mRenderX + mRenderW - sTouchW;
        sUpdate = 1;
        break;

    case TOUCH_RELEASE:
        if (!dragging)  return 0;
        if (sCurTouchX >= mRenderX + mRenderW - sTouchW)
        {
            sAction->doActions();
        }
        sCurTouchX = mRenderX;
        dragging = false;
        sUpdate = 1;
	case TOUCH_REPEAT:
	case TOUCH_HOLD:
        break;
    }
    return 0;
}