| // 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 |