Adding cursor support to ui::TextField

STTextField.cpp

//
//  STTextField.cpp
//  scgamex
//
//  Created by Steve Tranby on 7/11/15.
//
//

#include "stdafx.h"

#include "extensions/STTextField.h"

USING_NS_CC;

STTextField::STTextField() : _textField(nullptr) {}
STTextField::~STTextField() {}

STTextField* STTextField::create(const std::string& placeholder, const std::string&, float fontSize, const std::string &imageFileName, TextureResType texType)
{
    STTextField* widget = new (std::nothrow) STTextField();
    if (widget && widget->init(placeholder, kFontVisitor, fontSize, imageFileName, texType))
    {
        widget->autorelease();
        return widget;
    }
    CC_SAFE_DELETE(widget);
    return nullptr;
}

bool STTextField::init(const std::string& placeholder, const std::string&, float fontSize, const std::string &imageFileName, TextureResType texType)
{
    if(! ImageView::init(imageFileName, texType)) {
        return false;
    }

    // create textfield
    _textField = TextFieldTTF::textFieldWithPlaceHolder(placeholder, cocos2d::Size(0,0), TextHAlignment::LEFT, kFontVisitor, fontSize);
    _textField->setAnchorPoint(Vec2::ANCHOR_MIDDLE_LEFT);
    _textField->setTextColor(Color4B::WHITE);

//    _textField->setPlaceHolderColor(Color4B::WHITE);
    _textField->setPlaceHolder("Touch to Edit");
//    _textField->setMaxLength(20);
//    _textField->setMaxLengthEnabled(true);

    _textField->setCursorChar('|');
    _textField->setCursorEnabled(true);

    _textField->setNormalizedPosition(Vec2(.03f,.52f));
    _textField->setTag(1);
    addChild(_textField);

    setTouchEnabled(true);
    
    return true;
}

void STTextField::onEnter()
{
    ImageView::onEnter();
}

void STTextField::onExit()
{
    ImageView::onExit();
}

bool STTextField::hitTest(const Vec2 &pt, const Camera* camera, Vec3 *p2) const
{
    if (_textField) {
        auto p = convertToNodeSpace(pt);
        auto bboxSize = getBoundingBox().size;
        log("lbl->nsp(%s) = %s,  lbl->bbox = %s", CStrFromPoint(pt), CStrFromPoint(p), CStrFromSize(bboxSize));

        auto fontSize = 20.f;
        if(cocos2d::Rect(0, 0, bboxSize.width + fontSize, bboxSize.height).containsPoint(p))
        {
            // move cursor
            // fraction of width
            auto xrel = clampf(p.x / bboxSize.width, 0.f, 1.f);
            log("xrel = %f", xrel);
            float maxIndex = _textField->getStringLength();
            auto letterIndex = (int)(xrel / (1.f / maxIndex) + .5f);
            log("letterindex = %d", letterIndex);;

            _textField->attachWithIME();
            _textField->setCursorFromPoint(pt, camera);
        }
        else
        {
            _textField->detachWithIME();
        }
    }
    return ImageView::hitTest(pt, camera, p2);
}

void STTextField::moveCursorToEnd()
{
    _textField->setCursorPosition(_textField->getStringLength());
}

STTextField.h

//
//  STTextField.h
//  scgamex
//
//  Created by Steve Tranby on 7/11/15.
//
//

#pragma once

#include <ui/CocosGUI.h>

class STTextField : public cocos2d::ui::ImageView
{
public:
    STTextField();
    virtual ~STTextField();

    static STTextField* create(const std::string& placeholder, const std::string& fontName, float fontSize, const std::string& imageFileName, TextureResType texType = TextureResType::LOCAL);
    virtual bool init(const std::string& placeholder, const std::string& fontName, float fontSize, const std::string& imageFileName, TextureResType texType = TextureResType::LOCAL);

    ///////////////////

    void onEnter() override;
    void onExit() override;
    bool hitTest(const cocos2d::Vec2 &pt, const cocos2d::Camera* camera, cocos2d::Vec3 *p2) const override;

    ///////////////////

    void moveCursorToEnd();

    // PASSTHROUGH
    void attachWithIME() { if(_textField) _textField->attachWithIME(); }
    std::string getString() { return _textField ? _textField->getString() : ""; }
    void setString(std::string str) { if(_textField) _textField->setString(str); }

protected:
    cocos2d::TextFieldTTF* _textField;
    cocos2d::Label* _cursorLabel;
};