src/gui/guiEditBoxWithScrollbar.cpp


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// Copyright (C) 2002-2012 Nikolaus Gebhardt
// Modified by Mustapha T.
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h

#include "guiEditBoxWithScrollbar.h"

#include "IGUISkin.h"
#include "IGUIEnvironment.h"
#include "IGUIFont.h"
#include "IVideoDriver.h"
#include "rect.h"
#include "porting.h"
#include "Keycodes.h"

/*
todo:
optional scrollbars [done]
ctrl+left/right to select word
double click/ctrl click: word select + drag to select whole words, triple click to select line
optional? dragging selected text
numerical
*/


//! constructor
GUIEditBoxWithScrollBar::GUIEditBoxWithScrollBar(const wchar_t* text, bool border,
	IGUIEnvironment* environment, IGUIElement* parent, s32 id,
	const core::rect<s32>& rectangle, bool writable, bool has_vscrollbar)
	: IGUIEditBox(environment, parent, id, rectangle), m_mouse_marking(false),
	m_border(border), m_background(true), m_override_color_enabled(false), m_mark_begin(0), m_mark_end(0),
	m_override_color(video::SColor(101, 255, 255, 255)), m_override_font(0), m_last_break_font(0),
	m_operator(0), m_blink_start_time(0), m_cursor_pos(0), m_hscroll_pos(0), m_vscroll_pos(0), m_max(0),
	m_word_wrap(false), m_multiline(false), m_autoscroll(true), m_passwordbox(false),
	m_passwordchar(L'*'), m_halign(EGUIA_UPPERLEFT), m_valign(EGUIA_CENTER),
	m_current_text_rect(0, 0, 1, 1), m_frame_rect(rectangle),
	m_scrollbar_width(0), m_vscrollbar(NULL), m_writable(writable),
	m_bg_color_used(false)
{
#ifdef _DEBUG
	setDebugName("GUIEditBoxWithScrollBar");
#endif


	Text = text;

	if (Environment)
		m_operator = Environment->getOSOperator();

	if (m_operator)
		m_operator->grab();

	// this element can be tabbed to
	setTabStop(true);
	setTabOrder(-1);

	if (has_vscrollbar) {
		createVScrollBar();
	}

	calculateFrameRect();
	breakText();

	calculateScrollPos();
	setWritable(writable);
}


//! destructor
GUIEditBoxWithScrollBar::~GUIEditBoxWithScrollBar()
{
	if (m_override_font)
		m_override_font->drop();

	if (m_operator)
		m_operator->drop();

	if (m_vscrollbar)
		m_vscrollbar->drop();
}


//! Sets another skin independent font.
void GUIEditBoxWithScrollBar::setOverrideFont(IGUIFont* font)
{
	if (m_override_font == font)
		return;

	if (m_override_font)
		m_override_font->drop();

	m_override_font = font;

	if (m_override_font)
		m_override_font->grab();

	breakText();
}

//! Gets the override font (if any)
IGUIFont * GUIEditBoxWithScrollBar::getOverrideFont() const
{
	return m_override_font;
}

//! Get the font which is used right now for drawing
IGUIFont* GUIEditBoxWithScrollBar::getActiveFont() const
{
	if (m_override_font)
		return m_override_font;
	IGUISkin* skin = Environment->getSkin();
	if (skin)
		return skin->getFont();
	return 0;
}

//! Sets another color for the text.
void GUIEditBoxWithScrollBar::setOverrideColor(video::SColor color)
{
	m_override_color = color;
	m_override_color_enabled = true;
}


video::SColor GUIEditBoxWithScrollBar::getOverrideColor() const
{
	return m_override_color;
}


//! Turns the border on or off
void GUIEditBoxWithScrollBar::setDrawBorder(bool border)
{
	m_border = border;
}

//! Sets whether to draw the background
void GUIEditBoxWithScrollBar::setDrawBackground(bool draw)
{
	m_background = draw;
}

//! Sets if the text should use the overide color or the color in the gui skin.
void GUIEditBoxWithScrollBar::enableOverrideColor(bool enable)
{
	m_override_color_enabled = enable;
}

bool GUIEditBoxWithScrollBar::isOverrideColorEnabled() const
{
	return m_override_color_enabled;
}

//! Enables or disables word wrap
void GUIEditBoxWithScrollBar::setWordWrap(bool enable)
{
	m_word_wrap = enable;
	breakText();
}


void GUIEditBoxWithScrollBar::updateAbsolutePosition()
{
	core::rect<s32> old_absolute_rect(AbsoluteRect);
	IGUIElement::updateAbsolutePosition();
	if (old_absolute_rect != AbsoluteRect) {
		calculateFrameRect();
		breakText();
		calculateScrollPos();
	}
}

//! Checks if word wrap is enabled
bool GUIEditBoxWithScrollBar::isWordWrapEnabled() const
{
	return m_word_wrap;
}


//! Enables or disables newlines.
void GUIEditBoxWithScrollBar::setMultiLine(bool enable)
{
	m_multiline = enable;
}


//! Checks if multi line editing is enabled
bool GUIEditBoxWithScrollBar::isMultiLineEnabled() const
{
	return m_multiline;
}


void GUIEditBoxWithScrollBar::setPasswordBox(bool password_box, wchar_t password_char)
{
	m_passwordbox = password_box;
	if (m_passwordbox) {
		m_passwordchar = password_char;
		setMultiLine(false);
		setWordWrap(false);
		m_broken_text.clear();
	}
}


bool GUIEditBoxWithScrollBar::isPasswordBox() const
{
	return m_passwordbox;
}


//! Sets text justification
void GUIEditBoxWithScrollBar::setTextAlignment(EGUI_ALIGNMENT horizontal, EGUI_ALIGNMENT vertical)
{
	m_halign = horizontal;
	m_valign = vertical;
}


//! called if an event happened.
bool GUIEditBoxWithScrollBar::OnEvent(const SEvent& event)
{
	if (isEnabled()) {
		switch (event.EventType)
		{
		case EET_GUI_EVENT:
			if (event.GUIEvent.EventType == EGET_ELEMENT_FOCUS_LOST) {
				if (event.GUIEvent.Caller == this) {
					m_mouse_marking = false;
					setTextMarkers(0, 0);
				}
			}
			break;
		case EET_KEY_INPUT_EVENT:
			if (processKey(event))
				return true;
			break;
		case EET_MOUSE_INPUT_EVENT:
			if (processMouse(event))
				return true;
			break;
		default:
			break;
		}
	}

	return IGUIElement::OnEvent(event);
}


bool GUIEditBoxWithScrollBar::processKey(const SEvent& event)
{
	if (!m_writable) {
		return false;
	}

	if (!event.KeyInput.PressedDown)
		return false;

	bool text_changed = false;
	s32 new_mark_begin = m_mark_begin;
	s32 new_mark_end = m_mark_end;

	// control shortcut handling

	if (event.KeyInput.Control) {

		// german backlash '\' entered with control + '?'
		if (event.KeyInput.Char == '\\') {
			inputChar(event.KeyInput.Char);
			return true;
		}

		switch (event.KeyInput.Key) {
		case KEY_KEY_A:
			// select all
			new_mark_begin = 0;
			new_mark_end = Text.size();
			break;
		case KEY_KEY_C:
			// copy to clipboard
			if (!m_passwordbox && m_operator && m_mark_begin != m_mark_end)
			{
				const s32 realmbgn = m_mark_begin < m_mark_end ? m_mark_begin : m_mark_end;
				const s32 realmend = m_mark_begin < m_mark_end ? m_mark_end : m_mark_begin;

				core::stringc s;
				s = Text.subString(realmbgn, realmend - realmbgn).c_str();
				m_operator->copyToClipboard(s.c_str());
			}
			break;
		case KEY_KEY_X:
			// cut to the clipboard
			if (!m_passwordbox && m_operator && m_mark_begin != m_mark_end) {
				const s32 realmbgn = m_mark_begin < m_mark_end ? m_mark_begin : m_mark_end;
				const s32 realmend = m_mark_begin < m_mark_end ? m_mark_end : m_mark_begin;

				// copy
				core::stringc sc;
				sc = Text.subString(realmbgn, realmend - realmbgn).c_str();
				m_operator->copyToClipboard(sc.c_str());

				if (isEnabled())
				{
					// delete
					core::stringw s;
					s = Text.subString(0, realmbgn);
					s.append(Text.subString(realmend, Text.size() - realmend));
					Text = s;

					m_cursor_pos = realmbgn;
					new_mark_begin = 0;
					new_mark_end = 0;
					text_changed = true;
				}
			}
			break;
		case KEY_KEY_V:
			if (!isEnabled())
				break;

			// paste from the clipboard
			if (m_operator) {
				const s32 realmbgn = m_mark_begin < m_mark_end ? m_mark_begin : m_mark_end;
				const s32 realmend = m_mark_begin < m_mark_end ? m_mark_end : m_mark_begin;

				// add new character
				const c8* p = m_operator->getTextFromClipboard();
				if (p) {
					if (m_mark_begin == m_mark_end) {
						// insert text
						core::stringw s = Text.subString(0, m_cursor_pos);
						s.append(p);
						s.append(Text.subString(m_cursor_pos, Text.size() - m_cursor_pos));

						if (!m_max || s.size() <= m_max) // thx to Fish FH for fix
						{
							Text = s;
							s = p;
							m_cursor_pos += s.size();
						}
					} else {
						// replace text

						core::stringw s = Text.subString(0, realmbgn);
						s.append(p);
						s.append(Text.subString(realmend, Text.size() - realmend));

						if (!m_max || s.size() <= m_max)  // thx to Fish FH for fix
						{
							Text = s;
							s = p;
							m_cursor_pos = realmbgn + s.size();
						}
					}