pdf/control.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "pdf/control.h"
   6
   7 #include "base/logging.h"
   8 #include "pdf/draw_utils.h"
   9
  10 namespace chrome_pdf {
  11
  12 Control::Control()
  13     : id_(kInvalidControlId),
  14       visible_(false),
  15       owner_(NULL),
  16       transparency_(kOpaqueAlpha) {
  17 }
  18
  19 Control::~Control() {
  20 }
  21
  22 bool Control::Create(uint32 id, const pp::Rect& rc,
  23                      bool visible, Owner* owner) {
  24   DCHECK(owner);
  25   if (owner_ || id == kInvalidControlId)
  26     return false;  // Already created or id is invalid.
  27   id_ = id;
  28   rc_ = rc;
  29   visible_ = visible;
  30   owner_ = owner;
  31   return true;
  32 }
  33
  34 bool Control::HandleEvent(const pp::InputEvent& event) {
  35   return false;
  36 }
  37
  38 void Control::PaintMultipleRects(pp::ImageData* image_data,
  39                                  const std::list<pp::Rect>& rects) {
  40   DCHECK(rects.size() > 0);
  41   if (rects.size() == 1) {
  42     Paint(image_data, rects.front());
  43     return;
  44   }
  45
  46   // Some rects in the input list may overlap. To prevent double
  47   // painting (causes problems with semi-transparent controls) we'll
  48   // paint control into buffer image data only once and copy requested
  49   // rectangles.
  50   pp::ImageData buffer(owner()->GetInstance(), image_data->format(),
  51                        rect().size(), false);
  52   if (buffer.is_null())
  53     return;
  54
  55   pp::Rect draw_rc = pp::Rect(image_data->size()).Intersect(rect());
  56   pp::Rect ctrl_rc = pp::Rect(draw_rc.point() - rect().point(), draw_rc.size());
  57   CopyImage(*image_data, draw_rc, &buffer, ctrl_rc, false);
  58
  59   // Temporary move control to origin (0,0) and draw it into temp buffer.
  60   // Move to the original position afterward. Since this is going on temp
  61   // buffer, we don't need to invalidate here.
  62   pp::Rect temp = rect();
  63   MoveTo(pp::Point(0, 0), false);
  64   Paint(&buffer, ctrl_rc);
  65   MoveTo(temp.point(), false);
  66
  67   std::list<pp::Rect>::const_iterator iter;
  68   for (iter = rects.begin(); iter != rects.end(); ++iter) {
  69     pp::Rect draw_rc = rect().Intersect(*iter);
  70     if (!draw_rc.IsEmpty()) {
  71       // Copy requested rect from the buffer image.
  72       pp::Rect src_rc = draw_rc;
  73       src_rc.Offset(-rect().x(), -rect().y());
  74       CopyImage(buffer, src_rc, image_data, draw_rc, false);
  75     }
  76   }
  77 }
  78
  79 void Control::Show(bool visible, bool invalidate) {
  80   if (visible_ != visible) {
  81     visible_ = visible;
  82     if (invalidate)
  83       owner_->Invalidate(id_, rc_);
  84   }
  85 }
  86
  87 void Control::AdjustTransparency(uint8 transparency, bool invalidate) {
  88   if (transparency_ != transparency) {
  89     transparency_ = transparency;
  90     if (invalidate && visible_)
  91       owner_->Invalidate(id_, rc_);
  92   }
  93 }
  94
  95 void Control::MoveBy(const pp::Point& offset, bool invalidate) {
  96   pp::Rect old_rc = rc_;
  97   rc_.Offset(offset);
  98   if (invalidate && visible_) {
  99     owner()->Invalidate(id(), old_rc);
 100     owner()->Invalidate(id(), rect());
 101   }
 102 }
 103
 104 void Control::SetRect(const pp::Rect& rc, bool invalidate) {
 105   pp::Rect old_rc = rc_;
 106   rc_ = rc;
 107   if (invalidate && visible_) {
 108     owner()->Invalidate(id(), old_rc);
 109     owner()->Invalidate(id(), rect());
 110   }
 111 }
 112
 113 void Control::MoveTo(const pp::Point& origin, bool invalidate) {
 114   MoveBy(origin - rc_.point(), invalidate);
 115 }
 116
 117 }  // namespace chrome_pdf