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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "pdf/thumbnail_control.h"
#include <algorithm>
#include "base/logging.h"
#include "base/strings/string_util.h"
#include "pdf/draw_utils.h"
#include "pdf/number_image_generator.h"
namespace chrome_pdf {
const int kLeftBorderSize = 52;
const int kBorderSize = 12;
const int kHighlightBorderSize = 2;
const uint32 kLeftColor = 0x003F537B;
const uint32 kRightColor = 0x990D1626;
const uint32 kTopHighlightColor = 0xFF426DC9;
const uint32 kBottomHighlightColor = 0xFF6391DE;
const uint32 kThumbnailBackgroundColor = 0xFF000000;
const uint32 kSlidingTimeoutMs = 50;
const int32 kSlidingShift = 50;
const double kNonSelectedThumbnailAlpha = 0.91;
ThumbnailControl::ThumbnailControl()
: engine_(NULL), sliding_width_(0), sliding_shift_(kSlidingShift),
sliding_timeout_(kSlidingTimeoutMs), sliding_timer_id_(0) {
}
ThumbnailControl::~ThumbnailControl() {
ClearCache();
}
bool ThumbnailControl::CreateThumbnailControl(
uint32 id, const pp::Rect& rc,
bool visible, Owner* owner, PDFEngine* engine,
NumberImageGenerator* number_image_generator) {
engine_ = engine;
number_image_generator_ = number_image_generator;
sliding_width_ = rc.width();
return Control::Create(id, rc, visible, owner);
}
void ThumbnailControl::SetPosition(int position, int total, bool invalidate) {
visible_rect_ = pp::Rect();
visible_pages_.clear();
if (rect().width() < kLeftBorderSize + kBorderSize) {
return; // control is too narrow to show thumbnails.
}
int num_pages = engine_->GetNumberOfPages();
int max_doc_width = 0, total_doc_height = 0;
std::vector<pp::Rect> page_sizes(num_pages);
for (int i = 0; i < num_pages; ++i) {
page_sizes[i] = engine_->GetPageRect(i);
max_doc_width = std::max(max_doc_width, page_sizes[i].width());
total_doc_height += page_sizes[i].height();
}
if (!max_doc_width)
return;
int max_thumbnail_width = rect().width() - kLeftBorderSize - kBorderSize;
double thumbnail_ratio =
max_thumbnail_width / static_cast<double>(max_doc_width);
int total_thumbnail_height = 0;
for (int i = 0; i < num_pages; ++i) {
total_thumbnail_height += kBorderSize;
int thumbnail_width =
static_cast<int>(page_sizes[i].width() * thumbnail_ratio);
int thumbnail_height =
static_cast<int>(page_sizes[i].height() * thumbnail_ratio);
int x = (max_thumbnail_width - thumbnail_width) / 2;
page_sizes[i] =
pp::Rect(x, total_thumbnail_height, thumbnail_width, thumbnail_height);
total_thumbnail_height += thumbnail_height;
}
total_thumbnail_height += kBorderSize;
int visible_y = 0;
if (total > 0) {
double range = total_thumbnail_height - rect().height();
if (range < 0)
range = 0;
visible_y = static_cast<int>(range * position / total);
}
visible_rect_ = pp::Rect(0, visible_y, max_thumbnail_width, rect().height());
for (int i = 0; i < num_pages; ++i) {
if (page_sizes[i].Intersects(visible_rect_)) {
PageInfo page_info;
page_info.index = i;
page_info.rect = page_sizes[i];
page_info.rect.Offset(kLeftBorderSize, -visible_rect_.y());
visible_pages_.push_back(page_info);
}
}
if (invalidate)
owner()->Invalidate(id(), rect());
}
void ThumbnailControl::Show(bool visible, bool invalidate) {
if (!visible || invalidate)
ClearCache();
sliding_width_ = rect().width();
Control::Show(visible, invalidate);
}
void ThumbnailControl::SlideIn() {
if (visible())
return;
Show(true, false);
sliding_width_ = 0;
sliding_shift_ = kSlidingShift;
sliding_timer_id_ = owner()->ScheduleTimer(id(), sliding_timeout_);
owner()->Invalidate(id(), rect());
}
void ThumbnailControl::SlideOut() {
if (!visible())
return;
sliding_shift_ = -kSlidingShift;
sliding_timer_id_ = owner()->ScheduleTimer(id(), sliding_timeout_);
}
void ThumbnailControl::Paint(pp::ImageData* image_data, const pp::Rect& rc) {
if (!visible())
return;
pp::Rect control_rc(rect());
control_rc.Offset(control_rc.width() - sliding_width_, 0);
control_rc.set_width(sliding_width_);
pp::Rect draw_rc = rc.Intersect(control_rc);
if (draw_rc.IsEmpty())
return;
pp::Rect gradient_rc(control_rc.x(), draw_rc.y(),
control_rc.width(), draw_rc.height());
GradientFill(owner()->GetInstance(),
image_data,
draw_rc,
gradient_rc,
kLeftColor,
kRightColor,
true,
transparency());
int selected_page = engine_->GetMostVisiblePage();
for (size_t i = 0; i < visible_pages_.size(); ++i) {
pp::Rect page_rc = visible_pages_[i].rect;
page_rc.Offset(control_rc.point());
if (visible_pages_[i].index == selected_page) {
pp::Rect highlight_rc = page_rc;
highlight_rc.Inset(-kHighlightBorderSize, -kHighlightBorderSize);
GradientFill(owner()->GetInstance(),
image_data,
draw_rc,
highlight_rc,
kTopHighlightColor,
kBottomHighlightColor,
false,
transparency());
}
pp::Rect draw_page_rc = page_rc.Intersect(draw_rc);
if (draw_page_rc.IsEmpty())
continue;
// First search page image in the cache.
pp::ImageData* thumbnail = NULL;
std::map<int, pp::ImageData*>::iterator it =
image_cache_.find(visible_pages_[i].index);
if (it != image_cache_.end()) {
if (it->second->size() == page_rc.size())
thumbnail = image_cache_[visible_pages_[i].index];
else
image_cache_.erase(it);
}
// If page is not found in the cache, create new one.
if (thumbnail == NULL) {
thumbnail = new pp::ImageData(owner()->GetInstance(),
PP_IMAGEDATAFORMAT_BGRA_PREMUL,
page_rc.size(),
false);
engine_->PaintThumbnail(thumbnail, visible_pages_[i].index);
pp::ImageData page_number;
number_image_generator_->GenerateImage(
visible_pages_[i].index + 1, &page_number);
pp::Point origin(
(thumbnail->size().width() - page_number.size().width()) / 2,
(thumbnail->size().height() - page_number.size().height()) / 2);
if (origin.x() > 0 && origin.y() > 0) {
AlphaBlend(page_number, pp::Rect(pp::Point(), page_number.size()),
thumbnail, origin, kOpaqueAlpha);
}
image_cache_[visible_pages_[i].index] = thumbnail;
}
uint8 alpha = transparency();
if (visible_pages_[i].index != selected_page)
alpha = static_cast<uint8>(alpha * kNonSelectedThumbnailAlpha);
FillRect(image_data, draw_page_rc, kThumbnailBackgroundColor);
draw_page_rc.Offset(-page_rc.x(), -page_rc.y());
AlphaBlend(*thumbnail, draw_page_rc, image_data,
draw_page_rc.point() + page_rc.point(), alpha);
}
}
bool ThumbnailControl::HandleEvent(const pp::InputEvent& event) {
if (!visible())
return false;
pp::MouseInputEvent mouse_event(event);
if (mouse_event.is_null())
return false;
pp::Point pt = mouse_event.GetPosition();
if (!rect().Contains(pt))
return false;
int over_page = -1;
for (size_t i = 0; i < visible_pages_.size(); ++i) {
pp::Rect page_rc = visible_pages_[i].rect;
page_rc.Offset(rect().point());
if (page_rc.Contains(pt)) {
over_page = i;
break;
}
}
bool handled = false;
switch (event.GetType()) {
case PP_INPUTEVENT_TYPE_MOUSEMOVE:
owner()->SetCursor(id(),
over_page == -1 ? PP_CURSORTYPE_POINTER : PP_CURSORTYPE_HAND);
break;
case PP_INPUTEVENT_TYPE_MOUSEDOWN:
if (over_page != -1) {
owner()->Invalidate(id(), rect());
owner()->OnEvent(id(), EVENT_ID_THUMBNAIL_SELECTED,
&visible_pages_[over_page].index);
}
handled = true;
break;
default:
break;
}
return handled;
}
void ThumbnailControl::OnTimerFired(uint32 timer_id) {
if (timer_id == sliding_timer_id_) {
sliding_width_ += sliding_shift_;
if (sliding_width_ <= 0) {
// We completely slided out. Make control invisible now.
Show(false, false);
} else if (sliding_width_ >= rect().width()) {
// We completely slided in. Make sliding width to full control width.
sliding_width_ = rect().width();
} else {
// We have not completed sliding yet. Keep sliding.
sliding_timer_id_ = owner()->ScheduleTimer(id(), sliding_timeout_);
}
owner()->Invalidate(id(), rect());
}
}
void ThumbnailControl::ResetEngine(PDFEngine* engine) {
engine_ = engine;
ClearCache();
}
void ThumbnailControl::ClearCache() {
std::map<int, pp::ImageData*>::iterator it;
for (it = image_cache_.begin(); it != image_cache_.end(); ++it) {
delete it->second;
}
image_cache_.clear();
}
} // namespace chrome_pdf