android_bootable_recovery/gui/text.cpp

/*
        Copyright 2012 to 2020 TeamWin
        This file is part of TWRP/TeamWin Recovery Project.

        TWRP is free software: you can redistribute it and/or modify
        it under the terms of the GNU General Public License as published by
        the Free Software Foundation, either version 3 of the License, or
        (at your option) any later version.

        TWRP is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        GNU General Public License for more details.

        You should have received a copy of the GNU General Public License
        along with TWRP.  If not, see <http://www.gnu.org/licenses/>.
*/

// text.cpp - GUIText object

#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 "../minuitwrp/truetype.hpp"

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

GUIText::GUIText(xml_node<>* node)
	: GUIObject(node)
{
	mFont = NULL;
	mIsStatic = 1;
	mVarChanged = 0;
	mFontHeight = 0;
	maxWidth = 0;
	scaleWidth = true;
	isHighlighted = false;
	mText = "";

	if (!node)
		return;

	// Load colors
	mColor = LoadAttrColor(node, "color", COLOR(0,0,0,255));
	mHighlightColor = LoadAttrColor(node, "highlightcolor", mColor);

	// Load the font, and possibly override the color
	mFont = LoadAttrFont(FindNode(node, "font"), "resource");
	if (!mFont || !mFont->GetResource())
		return;
	mColor = LoadAttrColor(FindNode(node, "font"), "color", mColor);
	mHighlightColor = LoadAttrColor(FindNode(node, "font"), "highlightcolor", mColor);

	// Load the placement
	LoadPlacement(FindNode(node, "placement"), &mRenderX, &mRenderY, &mRenderW, &mRenderH, &mPlacement);

	xml_node<>* child = FindNode(node, "text");
	if (child)  mText = child->value();

	child = FindNode(node, "noscaling");
	if (child) {
		scaleWidth = false;
	} else {
		if (mPlacement == TOP_LEFT || mPlacement == BOTTOM_LEFT) {
			maxWidth = gr_fb_width() - mRenderX;
		} else if (mPlacement == TOP_RIGHT || mPlacement == BOTTOM_RIGHT) {
			maxWidth = mRenderX;
		} else if (mPlacement == CENTER || mPlacement == CENTER_X_ONLY) {
			if (mRenderX < gr_fb_width() / 2) {
				maxWidth = mRenderX * 2;
			} else {
				maxWidth = (gr_fb_width() - mRenderX) * 2;
			}
		}
	}

	// Simple way to check for static state
	mLastValue = gui_parse_text(mText);
	if (mLastValue != mText)   mIsStatic = 0;

	mFontHeight = mFont->GetHeight();
}

int GUIText::Render(void)
{
	if (!isConditionTrue())
		return 0;

	void* fontResource = NULL;
	if (mFont)
		fontResource = mFont->GetResource();
	else
		return -1;

	mLastValue = gui_parse_text(mText);

	mVarChanged = 0;

	if (isHighlighted)
		gr_color(mHighlightColor.red, mHighlightColor.green, mHighlightColor.blue, mHighlightColor.alpha);
	else
		gr_color(mColor.red, mColor.green, mColor.blue, mColor.alpha);

	gr_textEx_scaleW(mRenderX, mRenderY, mLastValue.c_str(), fontResource, maxWidth, mPlacement, scaleWidth);

	return 0;
}

int GUIText::Update(void)
{
	if (!isConditionTrue())
		return 0;

	static int updateCounter = 3;

	// This hack just makes sure we update at least once a minute for things like clock and battery
	if (updateCounter)  updateCounter--;
	else
	{
		mVarChanged = 1;
		updateCounter = 3;
	}

	if (mIsStatic || !mVarChanged)
		return 0;

	std::string newValue = gui_parse_text(mText);
	if (mLastValue == newValue)
		return 0;
	else
		mLastValue = newValue;
	return 2;
}

int GUIText::GetCurrentBounds(int& w, int& h)
{
	void* fontResource = NULL;

	if (mFont)
		fontResource = mFont->GetResource();

	h = mFontHeight;
	mLastValue = gui_parse_text(mText);
	w = twrpTruetype::gr_ttf_measureEx(mLastValue.c_str(), fontResource);
	return 0;
}

int GUIText::NotifyVarChange(const std::string& varName, const std::string& value)
{
	GUIObject::NotifyVarChange(varName, value);

	mVarChanged = 1;
	return 0;
}

int GUIText::SetMaxWidth(unsigned width)
{
	maxWidth = width;
	if (!maxWidth)
		scaleWidth = false;
	mVarChanged = 1;
	return 0;
}

void GUIText::SetText(string newtext)
{
	mText = newtext;
}