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documentwidget.cpp
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documentwidget.cpp
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/** @file documentwidget.cpp Widget for displaying large amounts of text.
*
* @authors Copyright (c) 2013 Jaakko Keränen <jaakko.keranen@iki.fi>
*
* @par License
* LGPL: http://www.gnu.org/licenses/lgpl.html
*
* <small>This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at your
* option) any later version. This program 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 Lesser
* General Public License for more details. You should have received a copy of
* the GNU Lesser General Public License along with this program; if not, see:
* http://www.gnu.org/licenses</small>
*/
#include "de/DocumentWidget"
#include "de/ProgressWidget"
#include "de/TextDrawable"
#include <de/Drawable>
namespace de {
static int const ID_BACKGROUND = 1; // does not scroll
static int const ID_TEXT = 2; // scrolls
DENG_GUI_PIMPL(DocumentWidget),
public Font::RichFormat::IStyle
{
typedef DefaultVertexBuf VertexBuf;
ProgressWidget *progress = nullptr;
// Style.
ColorBank::Color normalColor;
ColorBank::Color highlightColor;
ColorBank::Color dimmedColor;
ColorBank::Color accentColor;
ColorBank::Color dimAccentColor;
// State.
ui::SizePolicy widthPolicy = ui::Expand;
int maxLineWidth;
ConstantRule *contentMaxWidth = new ConstantRule(0);
int oldScrollY = 0;
String styledText;
String text;
// GL objects.
TextDrawable glText;
Drawable drawable;
Matrix4f modelMatrix;
GLState clippedTextState;
GLUniform uMvpMatrix { "uMvpMatrix", GLUniform::Mat4 };
GLUniform uScrollMvpMatrix { "uMvpMatrix", GLUniform::Mat4 };
GLUniform uColor { "uColor", GLUniform::Vec4 };
Impl(Public *i) : Base(i)
{
updateStyle();
// Widget to show while lines are being wrapped.
progress = new ProgressWidget("progress-indicator");
progress->setColor("progress.dark.wheel");
progress->setShadowColor("progress.dark.shadow");
progress->rule().setRect(self().rule());
progress->hide();
self().add(progress);
maxLineWidth = GuiWidget::toDevicePixels(1000);
}
~Impl()
{
releaseRef(contentMaxWidth);
}
void updateStyle()
{
Style const &st = style();
normalColor = st.colors().color("document.normal");
highlightColor = st.colors().color("document.highlight");
dimmedColor = st.colors().color("document.dimmed");
accentColor = st.colors().color("document.accent");
dimAccentColor = st.colors().color("document.dimaccent");
glText.setFont(self().font());
self().requestGeometry();
}
Font::RichFormat::IStyle::Color richStyleColor(int index) const
{
switch (index)
{
default:
case Font::RichFormat::NormalColor:
return normalColor;
case Font::RichFormat::HighlightColor:
return highlightColor;
case Font::RichFormat::DimmedColor:
return dimmedColor;
case Font::RichFormat::AccentColor:
return accentColor;
case Font::RichFormat::DimAccentColor:
return dimAccentColor;
}
}
void richStyleFormat(int contentStyle,
float &sizeFactor,
Font::RichFormat::Weight &fontWeight,
Font::RichFormat::Style &fontStyle,
int &colorIndex) const
{
return style().richStyleFormat(contentStyle, sizeFactor, fontWeight, fontStyle, colorIndex);
}
Font const *richStyleFont(Font::RichFormat::Style fontStyle) const
{
if (fontStyle == Font::RichFormat::Monospace)
{
return &style().fonts().font(QStringLiteral("document.monospace"));
}
return style().richStyleFont(fontStyle);
}
void glInit()
{
atlas().audienceForReposition() += this;
glText.init(atlas(), self().font(), this);
self().setIndicatorUv(atlas().imageRectf(root().solidWhitePixel()).middle());
drawable.addBuffer(ID_BACKGROUND, new VertexBuf);
drawable.addBuffer(ID_TEXT, new VertexBuf);
shaders().build(drawable.program(), "generic.textured.color_ucolor")
<< uMvpMatrix << uColor << uAtlas();
shaders().build(drawable.addProgram(ID_TEXT), "generic.textured.color_ucolor")
<< uScrollMvpMatrix << uColor << uAtlas();
drawable.setProgram(ID_TEXT, drawable.program(ID_TEXT));
drawable.setState(ID_TEXT, clippedTextState);
}
void glDeinit()
{
atlas().audienceForReposition() -= this;
glText.deinit();
drawable.clear();
}
void atlasContentRepositioned(Atlas &atlas)
{
self().setIndicatorUv(atlas.imageRectf(root().solidWhitePixel()).middle());
self().requestGeometry();
}
void updateGeometry()
{
// If scroll position has changed, must update text geometry.
int scrollY = self().scrollPositionY().valuei();
if (oldScrollY != scrollY)
{
oldScrollY = scrollY;
self().requestGeometry();
}
Rectanglei pos;
if (self().hasChangedPlace(pos))
{
self().requestGeometry();
}
// Make sure the text has been wrapped for the current dimensions.
int wrapWidth;
if (widthPolicy == ui::Expand)
{
wrapWidth = maxLineWidth;
}
else
{
wrapWidth = self().rule().width().valuei() - self().margins().width().valuei();
}
glText.setLineWrapWidth(wrapWidth);
if (glText.update())
{
// Text is ready for drawing?
if (!glText.isBeingWrapped() && progress->isVisible())
{
contentMaxWidth->set(de::max(contentMaxWidth->value(), float(glText.wrappedSize().x)));
self().setContentSize(Vector2ui(contentMaxWidth->valuei(), glText.wrappedSize().y));
progress->hide();
}
self().requestGeometry();
}
if (!self().geometryRequested()) return;
// Background and scroll indicator.
VertexBuf::Builder verts;
self().glMakeGeometry(verts);
drawable.buffer<VertexBuf>(ID_BACKGROUND)
.setVertices(gl::TriangleStrip, verts, self().isScrolling()? gl::Dynamic : gl::Static);
uMvpMatrix = root().projMatrix2D();
if (!progress->isVisible())
{
DENG2_ASSERT(glText.isReady());
// Determine visible range of lines.
Font const &font = self().font();
int contentHeight = de::min(self().contentHeight(), self().rule().height().valuei());
int const extraLines = 1;
int numVisLines = contentHeight / font.lineSpacing().valuei() + 2 * extraLines;
int firstVisLine = scrollY / font.lineSpacing().valuei() - extraLines + 1;
// Update visible range and release/alloc lines accordingly.
Rangei visRange(firstVisLine, firstVisLine + numVisLines);
if (visRange != glText.range())
{
glText.setRange(visRange);
glText.update(); // alloc visible lines
VertexBuf::Builder verts;
glText.makeVertices(verts, Vector2i(0, 0), ui::AlignLeft);
drawable.buffer<VertexBuf>(ID_TEXT).setVertices(gl::TriangleStrip, verts, gl::Static);
// Update content size to match the generated vertices exactly.
self().setContentWidth(glText.verticesMaxWidth());
}
uScrollMvpMatrix = root().projMatrix2D() *
Matrix4f::translate(Vector2f(self().contentRule().left().valuei(),
self().contentRule().top().valuei()));
}
// Geometry is now up to date.
self().requestGeometry(false);
}
void draw()
{
updateGeometry();
uColor = Vector4f(1, 1, 1, self().visibleOpacity());
// Update the scissor for the text.
clippedTextState = GLState::current();
clippedTextState.setNormalizedScissor(self().normalizedContentRect());
drawable.draw();
}
};
DocumentWidget::DocumentWidget(String const &name)
: ScrollAreaWidget(name)
, d(new Impl(this))
{
setWidthPolicy(ui::Expand);
rule().setInput(Rule::Height, contentRule().height() + margins().height());
enableIndicatorDraw(true);
}
void DocumentWidget::setText(String const &styledText)
{
if (styledText != d->glText.text())
{
// Show the progress indicator until the text is ready for drawing.
if (d->drawable.hasBuffer(ID_TEXT))
{
d->drawable.buffer(ID_TEXT).clear();
}
d->progress->show();
int indSize = rule("document.progress").valuei();
setContentSize(Vector2i(indSize, indSize));
d->contentMaxWidth->set(indSize);
d->styledText = styledText;
d->glText.clear();
d->glText.setText(styledText);
d->glText.setRange(Rangei()); // none visible initially -- updated later
requestGeometry();
}
}
String DocumentWidget::text() const
{
return d->glText.text();
}
void DocumentWidget::setWidthPolicy(ui::SizePolicy policy)
{
d->widthPolicy = policy;
if (policy == ui::Expand)
{
rule().setInput(Rule::Width, *d->contentMaxWidth + margins().width());
}
else
{
rule().clearInput(Rule::Width);
}
requestGeometry();
}
void DocumentWidget::setMaximumLineWidth(int maxWidth)
{
d->maxLineWidth = maxWidth;
d->contentMaxWidth->set(0);
requestGeometry();
}
void DocumentWidget::viewResized()
{
ScrollAreaWidget::viewResized();
d->uMvpMatrix = root().projMatrix2D();
requestGeometry();
}
void DocumentWidget::drawContent()
{
d->draw();
ScrollAreaWidget::drawContent();
}
void DocumentWidget::glInit()
{
ScrollAreaWidget::glInit();
d->glInit();
}
void DocumentWidget::glDeinit()
{
ScrollAreaWidget::glDeinit();
d->glDeinit();
}
void DocumentWidget::updateStyle()
{
ScrollAreaWidget::updateStyle();
d->updateStyle();
}
} // namespace de