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// -*- Mode: C++; indent-tabs-mode: nil; tab-width: 2 -*-
/*
* Copyright (C) 2011-2014 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authored by: Mirco Müller <mirco.mueller@canonical.com>
* Marco Trevisan <marco.trevisan@canonical.com>
*/
#include <Nux/Nux.h>
#include <NuxGraphics/CairoGraphics.h>
#include "PlacesVScrollBar.h"
#include "unity-shared/CairoTexture.h"
#include "unity-shared/DashStyle.h"
#include "unity-shared/GraphicsUtils.h"
namespace unity
{
namespace dash
{
PlacesVScrollBar::PlacesVScrollBar(NUX_FILE_LINE_DECL)
: nux::VScrollBar(NUX_FILE_LINE_PARAM)
, scale(1.0)
, hovering(false)
{
Style::Instance().changed.connect(sigc::mem_fun(this, &PlacesVScrollBar::OnStyleChanged));
scale.changed.connect([this] (double scale) {
QueueRelayout();
QueueDraw();
});
}
void PlacesVScrollBar::OnStyleChanged()
{
slider_texture_.Release();
QueueDraw();
}
void PlacesVScrollBar::Draw(nux::GraphicsEngine& graphics_engine, bool force_draw)
{}
void PlacesVScrollBar::DrawContent(nux::GraphicsEngine& graphics_engine, bool force_draw)
{
if (!RedirectedAncestor())
return;
nux::Geometry const& base = GetGeometry();
nux::TexCoordXForm texxform;
graphics_engine.PushClippingRectangle(base);
unsigned int alpha = 0, src = 0, dest = 0;
graphics_engine.GetRenderStates().GetBlend(alpha, src, dest);
texxform.SetTexCoordType(nux::TexCoordXForm::OFFSET_SCALE_COORD);
graphics_engine.GetRenderStates().SetBlend(true);
graphics_engine.GetRenderStates().SetPremultipliedBlend(nux::SRC_OVER);
if (content_height_ > container_height_)
{
nux::Geometry const& slider_geo = _slider->GetGeometry();
nux::GetPainter().PushBackgroundStack();
if (hovering)
graphics::ClearGeometry(base);
nux::ROPConfig rop;
rop.Blend = true;
rop.SrcBlend = GL_ONE;
rop.DstBlend = GL_ONE_MINUS_SRC_ALPHA;
nux::ColorLayer layer(nux::color::Transparent, true, rop);
nux::GetPainter().PushDrawLayer(graphics_engine, base, &layer);
if (hovering)
{
auto const& track_color = Style::Instance().GetScrollbarTrackColor();
graphics_engine.QRP_Color(base.x, base.y, base.width, base.height, track_color * track_color.alpha);
}
UpdateTexture(slider_geo);
graphics_engine.QRP_1Tex(base.x + base.width - slider_geo.width,
slider_geo.y,
slider_geo.width,
slider_geo.height,
slider_texture_->GetDeviceTexture(),
texxform,
nux::color::White);
nux::GetPainter().PopBackgroundStack();
}
graphics_engine.PopClippingRectangle();
graphics_engine.GetRenderStates().SetBlend(alpha, src, dest);
}
void PlacesVScrollBar::UpdateTexture(nux::Geometry const& geo)
{
// update texture of slider
int width = geo.width;
int height = geo.height;
if (slider_texture_ && slider_texture_->GetWidth() == width && slider_texture_->GetHeight() == height)
return;
auto& style = Style::Instance();
double unscaled_width = static_cast<double>(width) / scale();
double unscaled_height = static_cast<double>(height) / scale();
nux::CairoGraphics cg(CAIRO_FORMAT_ARGB32, width, height);
auto* cr = cg.GetInternalContext();
cairo_surface_set_device_scale(cairo_get_target(cr), scale, scale);
cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
cairo_paint(cr);
auto const& color = hovering ? style.GetScrollbarColor() : style.GetOverlayScrollbarColor();
double radius = hovering ? style.GetScrollbarCornerRadius() : style.GetOverlayScrollbarCornerRadius();
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
cairo_set_source_rgba(cr, color.red, color.green, color.blue, color.alpha);
cg.DrawRoundedRectangle(cr, 1.0f, 0, 0, radius, unscaled_width, unscaled_height - 2.0);
cairo_fill(cr);
slider_texture_ = texture_ptr_from_cairo_graphics(cg);
}
} // namespace dash
} // namespace unity
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