ckTextArea.h

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/*
 *
 * Clapkit
 * ----------------------------------------------------------------------
 * A wrapper for creating a 'generalized' app for Classic MacOS
 * that (hopefully) can be ported easily to other platforms.
 *
 * CKTextArea
 * ----------------------------------------------------------------------
 * Defines a large text area, with or without scrollbars and editing enabled.
 *
 */
 
#pragma once
 
#include "ckApp.h"
#include "ckTextField.h"
#include <TextEdit.h>
 
class CKTextArea : public CKTextField {
 
    public:
        CKTextArea(const CKControlInitParams& params);
        ~CKTextArea();
 
        virtual void PrepareForDraw();
        virtual void Redraw();
 
        virtual void RaisePropertyChange(const char* propertyName);
        virtual bool HandleEvent(const CKEvent& evt);
 
        virtual void __UpdateTextScroll(int vDelta, int hDelta);
 
        virtual int __GetLineHeight() {
            if (!this->__teHandle) {
                return 0;
            }
            HLock((Handle)this->__teHandle);
            // TODO: Instead of hard-coding first line,
            // maybe we should determine what line is visible on top
            // and use that.
            int oneLinePixels = TEGetHeight(1, 0, this->__teHandle);
            HUnlock((Handle)this->__teHandle);
            return oneLinePixels;
        };
 
        virtual int __GetPageHeight() {
            if (!this->__teHandle) {
                return 0;
            }
            HLock((Handle)this->__teHandle);
            TEPtr te = *(this->__teHandle);
            int onePagePixels = te->viewRect.bottom - te->viewRect.top;
            HUnlock((Handle)this->__teHandle);
            return onePagePixels;
        };
 
    protected:
        virtual void ResizeTE();
        virtual void TECreated();
 
    private:
        virtual void __SetupScrollbars(bool removeOnly = false);
        virtual void __HandleScrollBarClick(ControlHandle ctl, CKPoint point);
 
    protected:
        ControlHandle __vScrollBar = nullptr;
        ControlHandle __hScrollBar = nullptr;
        bool __needsFullRedraw = true;
 
    public:
        CKProperty<CKScrollType> scrollType;
};