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nuttx-bb/NxWidgets/libnxwidgets/src/cscrollbarpanel.cxx

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/****************************************************************************
* NxWidgets/libnxwidgets/src/cscrollbarpanel.cxx
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX, NxWidgets, nor the names of its contributors
* me be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************
*
* Portions of this package derive from Woopsi (http://woopsi.org/) and
* portions are original efforts. It is difficult to determine at this
* point what parts are original efforts and which parts derive from Woopsi.
* However, in any event, the work of Antony Dzeryn will be acknowledged
* in most NxWidget files. Thanks Antony!
*
* Copyright (c) 2007-2011, Antony Dzeryn
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the names "Woopsi", "Simian Zombie" nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Antony Dzeryn ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL Antony Dzeryn BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include "cscrollbarpanel.hxx"
#include "cbutton.hxx"
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/****************************************************************************
* Method Implementations
****************************************************************************/
using namespace NXWidgets;
/**
* Constructor.
*
* @param pWidgetControl The widget control for the display.
* @param x The x coordinate of the widget.
* @param y The y coordinate of the widget.
* @param width The width of the widget.
* @param height The height of the widget.
* @param flags The usual widget flags.
* @param style The style that the widget should use. If this is not
* specified, the widget will use the values stored in the global
* g_defaultWidgetStyle object. The widget will copy the properties of
* the style into its own internal style object.
*/
CScollbarPanel::CScollbarPanel(CWidgetControl *pWidgetControl,
nxgl_coord_t x, nxgl_coord_t y,
nxgl_coord_t width, nxgl_coord_t height,
uint32_t flags, CWidgetStyle *style)
: CNxWidget(pWidgetControl, x, y, width, height, flags, style)
{
m_scrollbarWidth = 10;
m_scrollbarHeight = 10;
m_hasVerticalScrollbar = true;
m_hasHorizontalScrollbar = true;
m_borderSize.top = 0;
m_borderSize.right = 0;
m_borderSize.left = 0;
m_borderSize.bottom = 0;
m_flags.borderless = true;
m_widgetControl = pWidgetControl;
m_panel = (CScrollingPanel *)NULL;
m_scrollbarVertical = (CScrollbarVertical *)NULL;
m_scrollbarHorizontal = (CScrollbarHorizontal *)NULL;
buildUI();
}
/**
* Scroll the panel by the specified amounts.
*
* @param dx The horizontal distance to scroll.
* @param dy The vertical distance to scroll.
*/
void CScollbarPanel::scroll(int32_t dx, int32_t dy)
{
m_panel->scroll(dx, dy);
}
/**
* Reposition the panel's scrolling region to the specified coordinates.
*
* @param x The new x coordinate of the scrolling region.
* @param y The new y coordinate of the scrolling region.
*/
void CScollbarPanel::jump(int32_t x, int32_t y)
{
m_panel->jump(x, y);
}
/**
* Set whether or not horizontal scrolling is allowed.
*
* @param allow True to allow horizontal scrolling; false to deny it.
*/
void CScollbarPanel::setAllowsVerticalScroll(bool allow)
{
m_panel->setAllowsVerticalScroll(allow);
if (m_hasVerticalScrollbar)
{
if (allow)
{
m_scrollbarVertical->enable();
}
else
{
m_scrollbarVertical->disable();
}
}
}
/**
* Set whether or not horizontal scrolling is allowed.
*
* @param allow True to allow horizontal scrolling; false to deny it.
*/
void CScollbarPanel::setAllowsHorizontalScroll(bool allow)
{
m_panel->setAllowsHorizontalScroll(allow);
if (m_hasHorizontalScrollbar)
{
if (allow)
{
m_scrollbarHorizontal->enable();
}
else
{
m_scrollbarHorizontal->disable();
}
}
}
/**
* Sets the width of the virtual canvas.
*
* @param width The width of the virtual canvas.
*/
void CScollbarPanel::setCanvasWidth(const int32_t width)
{
m_panel->setCanvasWidth(width);
m_scrollbarHorizontal->setMaximumValue(width);
}
/**
* Sets the height of the virtual canvas.
*
* @param height The height of the virtual canvas.
*/
void CScollbarPanel::setCanvasHeight(const int32_t height)
{
m_panel->setCanvasHeight(height);
m_scrollbarVertical->setMaximumValue(height);
}
/**
* Returns true if vertical scrolling is allowed.
*
* @return True if vertical scrolling is allowed.
*/
bool CScollbarPanel::allowsVerticalScroll(void) const
{
return m_panel->allowsVerticalScroll();
}
/**
* Returns true if horizontal scrolling is allowed.
*
* @return True if horizontal scrolling is allowed.
*/
bool CScollbarPanel::allowsHorizontalScroll(void) const
{
return m_panel->allowsHorizontalScroll();
}
/**
* Gets the x coordinate of the virtual canvas.
*
* @return The x coordinate of the virtual canvas.
*/
const int32_t CScollbarPanel::getCanvasX(void) const
{
return m_panel->getCanvasX();
}
/**
* Gets the y coordinate of the virtual canvas.
*
* @return The y coordinate of the virtual canvas.
*/
const int32_t CScollbarPanel::getCanvasY(void) const
{
return m_panel->getCanvasY();
}
/**
* Gets the width of the virtual canvas.
*
* @return The width of the virtual canvas.
*/
const int32_t CScollbarPanel::getCanvasWidth(void) const
{
return m_panel->getCanvasWidth();
}
/**
* Gets the height of the virtual canvas.
*
* @return The height of the virtual canvas.
*/
const int32_t CScollbarPanel::getCanvasHeight(void) const
{
return m_panel->getCanvasHeight();
}
/**
* Handle a widget scroll event.
*
* @param e The event data.
*/
void CScollbarPanel::handleScrollEvent(const CWidgetEventArgs &e)
{
if (e.getSource() != NULL)
{
if (e.getSource() == m_panel)
{
if (m_scrollbarVertical != NULL)
{
m_scrollbarVertical->setRaisesEvents(false);
m_scrollbarVertical->setValue(0 - m_panel->getCanvasY());
m_scrollbarVertical->setRaisesEvents(true);
}
else if (m_scrollbarHorizontal != NULL)
{
m_scrollbarHorizontal->setRaisesEvents(false);
m_scrollbarHorizontal->setValue(0 - m_panel->getCanvasX());
m_scrollbarHorizontal->setRaisesEvents(true);
}
}
}
}
/**
* Handle a widget value change event.
*
* @param e The event data.
*/
void CScollbarPanel::handleValueChangeEvent(const CWidgetEventArgs &e)
{
if (e.getSource() != NULL)
{
if (e.getSource() == m_scrollbarVertical)
{
if (m_panel != NULL)
{
m_panel->setRaisesEvents(false);
m_panel->jump(m_panel->getCanvasX(), 0 - m_scrollbarVertical->getValue());
m_panel->setRaisesEvents(true);
}
}
else if (e.getSource() == m_scrollbarHorizontal)
{
if (m_panel != NULL)
{
m_panel->setRaisesEvents(false);
m_panel->jump(0 - m_scrollbarHorizontal->getValue(), m_panel->getCanvasY());
m_panel->setRaisesEvents(true);
}
}
}
}
/**
* Creates the child widgets.
*/
void CScollbarPanel::buildUI(void)
{
CRect rect;
getClientRect(rect);
nxgl_coord_t panelWidth = rect.getWidth();
if (m_hasVerticalScrollbar)
{
panelWidth -= m_scrollbarWidth;
}
nxgl_coord_t panelHeight = rect.getHeight();
if (m_hasHorizontalScrollbar)
{
panelHeight -= m_scrollbarHeight;
}
m_panel = new CScrollingPanel(m_widgetControl, rect.getX(), rect.getY(),
panelWidth, panelHeight, 0, &m_style);
addWidget(m_panel);
CRect panelRect;
m_panel->getClientRect(panelRect);
// Disable content scrolling by default, as the panel cannot be drawn to
// without some additional programmer effort
m_panel->setContentScrolled(false);
// Adjust scrollbar dimensions based on scrollbar visibility
nxgl_coord_t verticalScrollHeight = rect.getHeight();
if (m_hasHorizontalScrollbar)
{
verticalScrollHeight -= m_scrollbarHeight;
}
nxgl_coord_t horizontalScrollWidth = rect.getWidth();
if (m_hasVerticalScrollbar)
{
horizontalScrollWidth -= m_scrollbarWidth;
}
if (m_hasHorizontalScrollbar)
{
m_scrollbarHorizontal =
new CScrollbarHorizontal(m_widgetControl,
rect.getX(), rect.getHeight() - m_scrollbarHeight,
horizontalScrollWidth, m_scrollbarHeight,
&m_style);
m_scrollbarHorizontal->setMinimumValue(0);
m_scrollbarHorizontal->setMaximumValue(getCanvasWidth());
m_scrollbarHorizontal->setPageSize(panelRect.getWidth());
m_scrollbarHorizontal->addWidgetEventHandler(this);
addWidget(m_scrollbarHorizontal);
}
if (m_hasVerticalScrollbar)
{
m_scrollbarVertical =
new CScrollbarVertical(m_widgetControl,
rect.getWidth() - m_scrollbarWidth,
rect.getY(), m_scrollbarWidth,
verticalScrollHeight, &m_style);
m_scrollbarVertical->setMinimumValue(0);
m_scrollbarVertical->setMaximumValue(getCanvasHeight());
m_scrollbarVertical->setPageSize(panelRect.getHeight());
m_scrollbarVertical->addWidgetEventHandler(this);
addWidget(m_scrollbarVertical);
}
}
/**
* Draw the area of this widget that falls within the clipping region.
* Called by the redraw() function to draw all visible regions.
*
* @param port The CGraphicsPort to draw to.
* @see redraw()
*/
void CScollbarPanel::drawContents(CGraphicsPort *port)
{
port->drawFilledRect(0, 0, getWidth(), getHeight(), getBackgroundColor());
}
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