Quelle TaskbarPreview.cpp Sprache: C

/* vim: se cin sw=2 ts=2 et : */
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "TaskbarPreview.h"
#include <nsITaskbarPreviewController.h>
#include <windows.h>

#include <nsError.h>
#include <nsCOMPtr.h>
#include <nsIWidget.h>
#include <nsServiceManagerUtils.h>

#include "nsUXThemeData.h"
#include "nsWindow.h"
#include "nsAppShell.h"
#include "TaskbarPreviewButton.h"
#include "WinUtils.h"

#include "mozilla/dom/HTMLCanvasElement.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/DataSurfaceHelpers.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/Telemetry.h"

// Defined in dwmapi in a header that needs a higher numbered _WINNT #define
#ifndef DWM_SIT_DISPLAYFRAME
#  define DWM_SIT_DISPLAYFRAME 0x1
#endif

namespace mozilla {
namespace widget {

///////////////////////////////////////////////////////////////////////////////
// TaskbarPreview

TaskbarPreview::TaskbarPreview(ITaskbarList4* aTaskbar,
                               nsITaskbarPreviewController* aController,
                               HWND aHWND, nsIDocShell* aShell)
    : mTaskbar(aTaskbar),
      mController(aController),
      mWnd(aHWND),
      mVisible(false),
      mDocShell(do_GetWeakReference(aShell)) {}

TaskbarPreview::~TaskbarPreview() {
  // Avoid dangling pointer
  if (sActivePreview == this) sActivePreview = nullptr;

  // Our subclass should have invoked DetachFromNSWindow already.
  NS_ASSERTION(
      !mWnd,
      "TaskbarPreview::DetachFromNSWindow was not called before destruction");

  // Make sure to release before potentially uninitializing COM
  mTaskbar = nullptr;

  ::CoUninitialize();
}

nsresult TaskbarPreview::Init() {
  // TaskbarPreview may outlive the WinTaskbar that created it
  if (FAILED(::CoInitialize(nullptr))) {
    return NS_ERROR_NOT_INITIALIZED;
  }

  WindowHook* hook = GetWindowHook();
  if (!hook) {
    return NS_ERROR_NOT_AVAILABLE;
  }
  return hook->AddMonitor(WM_DESTROY, MainWindowHook, this);
}

NS_IMETHODIMP
TaskbarPreview::SetController(nsITaskbarPreviewController* aController) {
  NS_ENSURE_ARG(aController);

  mController = aController;
  return NS_OK;
}

NS_IMETHODIMP
TaskbarPreview::GetController(nsITaskbarPreviewController** aController) {
  NS_ADDREF(*aController = mController);
  return NS_OK;
}

NS_IMETHODIMP
TaskbarPreview::GetTooltip(nsAString& aTooltip) {
  aTooltip = mTooltip;
  return NS_OK;
}

NS_IMETHODIMP
TaskbarPreview::SetTooltip(const nsAString& aTooltip) {
  mTooltip = aTooltip;
  return CanMakeTaskbarCalls() ? UpdateTooltip() : NS_OK;
}

NS_IMETHODIMP
TaskbarPreview::SetVisible(bool visible) {
  if (mVisible == visible) return NS_OK;
  mVisible = visible;

  // If the nsWindow has already been destroyed but the caller is still trying
  // to use it then just pretend that everything succeeded.  The caller doesn't
  // actually have a way to detect this since it's the same case as when we
  // CanMakeTaskbarCalls returns false.
  if (!IsWindowAvailable()) return NS_OK;

  return visible ? Enable() : Disable();
}

NS_IMETHODIMP
TaskbarPreview::GetVisible(bool* visible) {
  *visible = mVisible;
  return NS_OK;
}

NS_IMETHODIMP
TaskbarPreview::SetActive(bool active) {
  if (active)
    sActivePreview = this;
  else if (sActivePreview == this)
    sActivePreview = nullptr;

  return CanMakeTaskbarCalls() ? ShowActive(active) : NS_OK;
}

NS_IMETHODIMP
TaskbarPreview::GetActive(bool* active) {
  *active = sActivePreview == this;
  return NS_OK;
}

NS_IMETHODIMP
TaskbarPreview::Invalidate() {
  if (!mVisible) return NS_OK;

  HWND previewWindow = PreviewWindow();
  return FAILED(DwmInvalidateIconicBitmaps(previewWindow)) ? NS_ERROR_FAILURE
                                                           : NS_OK;
}

nsresult TaskbarPreview::UpdateTaskbarProperties() {
  nsresult rv = UpdateTooltip();

  // If we are the active preview and our window is the active window, restore
  // our active state - otherwise some other non-preview window is now active
  // and should be displayed as so.
  if (sActivePreview == this) {
    if (mWnd == ::GetActiveWindow()) {
      nsresult rvActive = ShowActive(true);
      if (NS_FAILED(rvActive)) rv = rvActive;
    } else {
      sActivePreview = nullptr;
    }
  }
  return rv;
}

nsresult TaskbarPreview::Enable() {
  nsresult rv = NS_OK;
  if (CanMakeTaskbarCalls()) {
    rv = UpdateTaskbarProperties();
  } else if (IsWindowAvailable()) {
    WindowHook* hook = GetWindowHook();
    MOZ_ASSERT(hook,
               "IsWindowAvailable() should have eliminated the null case.");
    hook->AddMonitor(nsAppShell::GetTaskbarButtonCreatedMessage(),
                     MainWindowHook, this);
  }
  return rv;
}

nsresult TaskbarPreview::Disable() {
  if (!IsWindowAvailable()) {
    // Window is already destroyed
    return NS_OK;
  }

  WindowHook* hook = GetWindowHook();
  MOZ_ASSERT(hook, "IsWindowAvailable() should have eliminated the null case.");
  (void)hook->RemoveMonitor(nsAppShell::GetTaskbarButtonCreatedMessage(),
                            MainWindowHook, this);

  return NS_OK;
}

bool TaskbarPreview::IsWindowAvailable() const {
  if (mWnd) {
    nsWindow* win = WinUtils::GetNSWindowPtr(mWnd);
    if (win && !win->Destroyed()) {
      return true;
    }
  }
  return false;
}

void TaskbarPreview::DetachFromNSWindow() {
  if (WindowHook* hook = GetWindowHook()) {
    hook->RemoveMonitor(WM_DESTROY, MainWindowHook, this);
  }
  mWnd = nullptr;
}

LRESULT
TaskbarPreview::WndProc(UINT nMsg, WPARAM wParam, LPARAM lParam) {
  switch (nMsg) {
    case WM_DWMSENDICONICTHUMBNAIL: {
      uint32_t width = HIWORD(lParam);
      uint32_t height = LOWORD(lParam);
      float aspectRatio = width / float(height);

      nsresult rv;
      float preferredAspectRatio;
      rv = mController->GetThumbnailAspectRatio(&preferredAspectRatio);
      if (NS_FAILED(rv)) break;

      uint32_t thumbnailWidth = width;
      uint32_t thumbnailHeight = height;

      if (aspectRatio > preferredAspectRatio) {
        thumbnailWidth = uint32_t(thumbnailHeight * preferredAspectRatio);
      } else {
        thumbnailHeight = uint32_t(thumbnailWidth / preferredAspectRatio);
      }

      DrawBitmap(thumbnailWidth, thumbnailHeight, false);
    } break;
    case WM_DWMSENDICONICLIVEPREVIEWBITMAP: {
      uint32_t width, height;
      nsresult rv;
      rv = mController->GetWidth(&width);
      if (NS_FAILED(rv)) break;
      rv = mController->GetHeight(&height);
      if (NS_FAILED(rv)) break;

      double scale = StaticPrefs::layout_css_devPixelsPerPx();
      if (scale <= 0.0) {
        scale = WinUtils::LogToPhysFactor(PreviewWindow());
      }
      DrawBitmap(NSToIntRound(scale * width), NSToIntRound(scale * height),
                 true);
    } break;
  }
  return ::DefWindowProcW(PreviewWindow(), nMsg, wParam, lParam);
}

bool TaskbarPreview::CanMakeTaskbarCalls() {
  // If the nsWindow has already been destroyed and we know it but our caller
  // clearly doesn't so we can't make any calls.
  if (!mWnd) return false;
  // Certain functions like SetTabOrder seem to require a visible window. During
  // window close, the window seems to be hidden before being destroyed.
  if (!::IsWindowVisible(mWnd)) return false;
  if (mVisible) {
    nsWindow* window = WinUtils::GetNSWindowPtr(mWnd);
    NS_ASSERTION(window, "Could not get nsWindow from HWND");
    return window ? window->HasTaskbarIconBeenCreated() : false;
  }
  return false;
}

WindowHook* TaskbarPreview::GetWindowHook() {
  nsWindow* window = WinUtils::GetNSWindowPtr(mWnd);
  NS_ASSERTION(window, "Cannot use taskbar previews in an embedded context!");

  return window ? &window->GetWindowHook() : nullptr;
}

void TaskbarPreview::EnableCustomDrawing(HWND aHWND, bool aEnable) {
  BOOL enabled = aEnable;
  DwmSetWindowAttribute(aHWND, DWMWA_FORCE_ICONIC_REPRESENTATION, &enabled,
                        sizeof(enabled));

  DwmSetWindowAttribute(aHWND, DWMWA_HAS_ICONIC_BITMAP, &enabled,
                        sizeof(enabled));
}

nsresult TaskbarPreview::UpdateTooltip() {
  NS_ASSERTION(CanMakeTaskbarCalls() && mVisible,
               "UpdateTooltip called on invisible tab preview");

  if (FAILED(mTaskbar->SetThumbnailTooltip(PreviewWindow(), mTooltip.get())))
    return NS_ERROR_FAILURE;
  return NS_OK;
}

void TaskbarPreview::DrawBitmap(uint32_t width, uint32_t height,
                                bool isPreview) {
  nsresult rv;
  nsCOMPtr<nsITaskbarPreviewCallback> callback =
      do_CreateInstance("@mozilla.org/widget/taskbar-preview-callback;1", &rv);
  if (NS_FAILED(rv)) {
    return;
  }

  ((TaskbarPreviewCallback*)callback.get())->SetPreview(this);

  if (isPreview) {
    ((TaskbarPreviewCallback*)callback.get())->SetIsPreview();
    mController->RequestPreview(callback);
  } else {
    mController->RequestThumbnail(callback, width, height);
  }
}

///////////////////////////////////////////////////////////////////////////////
// TaskbarPreviewCallback

NS_IMPL_ISUPPORTS(TaskbarPreviewCallback, nsITaskbarPreviewCallback)

/* void done (in nsISupports aCanvas, in boolean aDrawBorder); */
NS_IMETHODIMP
TaskbarPreviewCallback::Done(nsISupports* aCanvas, bool aDrawBorder) {
  // We create and destroy TaskbarTabPreviews from front end code in response
  // to TabOpen and TabClose events. Each TaskbarTabPreview creates and owns a
  // proxy HWND which it hands to Windows as a tab identifier. When a tab
  // closes, TaskbarTabPreview Disable() method is called by front end, which
  // destroys the proxy window and clears mProxyWindow which is the HWND
  // returned from PreviewWindow(). So, since this is async, we should check to
  // be sure the tab is still alive before doing all this gfx work and making
  // dwm calls. To accomplish this we check the result of PreviewWindow().
  if (!aCanvas || !mPreview || !mPreview->PreviewWindow() ||
      !mPreview->IsWindowAvailable()) {
    return NS_ERROR_FAILURE;
  }

  nsCOMPtr<nsIContent> content(do_QueryInterface(aCanvas));
  auto canvas = dom::HTMLCanvasElement::FromNodeOrNull(content);
  if (!canvas) {
    return NS_ERROR_FAILURE;
  }

  RefPtr<gfx::SourceSurface> source = canvas->GetSurfaceSnapshot();
  if (!source) {
    return NS_ERROR_FAILURE;
  }
  RefPtr<gfxWindowsSurface> target = new gfxWindowsSurface(
      source->GetSize(), gfx::SurfaceFormat::A8R8G8B8_UINT32);
  if (target->CairoStatus() != CAIRO_STATUS_SUCCESS) {
    return NS_ERROR_FAILURE;
  }

  using DataSrcSurf = gfx::DataSourceSurface;
  RefPtr<DataSrcSurf> srcSurface = source->GetDataSurface();
  RefPtr<gfxImageSurface> imageSurface = target->GetAsImageSurface();
  if (!srcSurface || !imageSurface) {
    return NS_ERROR_FAILURE;
  }

  if (DataSrcSurf::ScopedMap const sourceMap(srcSurface, DataSrcSurf::READ);
      sourceMap.IsMapped()) {
    mozilla::gfx::CopySurfaceDataToPackedArray(
        sourceMap.GetData(), imageSurface->Data(), srcSurface->GetSize(),
        sourceMap.GetStride(), BytesPerPixel(srcSurface->GetFormat()));
  } else if (source->GetSize().IsEmpty()) {
    // A zero-size source-surface probably shouldn't happen, but is harmless
    // here. Fall through.
  } else {
    return NS_ERROR_FAILURE;
  }

  HDC hDC = target->GetDC();
  HBITMAP hBitmap = (HBITMAP)GetCurrentObject(hDC, OBJ_BITMAP);

  DWORD flags = aDrawBorder ? DWM_SIT_DISPLAYFRAME : 0;
  HRESULT hr;
  if (!mIsThumbnail) {
    POINT pptClient = {0, 0};
    hr = DwmSetIconicLivePreviewBitmap(mPreview->PreviewWindow(), hBitmap,
                                       &pptClient, flags);
  } else {
    hr = DwmSetIconicThumbnail(mPreview->PreviewWindow(), hBitmap, flags);
  }
  MOZ_ASSERT(SUCCEEDED(hr));
  mozilla::Unused << hr;
  return NS_OK;
}

/* static */
bool TaskbarPreview::MainWindowHook(void* aContext, HWND hWnd, UINT nMsg,
                                    WPARAM wParam, LPARAM lParam,
                                    LRESULT* aResult) {
  NS_ASSERTION(nMsg == nsAppShell::GetTaskbarButtonCreatedMessage() ||
                   nMsg == WM_DESTROY,
               "Window hook proc called with wrong message");
  NS_ASSERTION(aContext, "Null context in MainWindowHook");
  if (!aContext) return false;
  TaskbarPreview* preview = reinterpret_cast<TaskbarPreview*>(aContext);
  if (nMsg == WM_DESTROY) {
    // nsWindow is being destroyed
    // We can't really do anything at this point including removing hooks
    return false;
  } else {
    nsWindow* window = WinUtils::GetNSWindowPtr(preview->mWnd);
    if (window) {
      window->SetHasTaskbarIconBeenCreated();

      if (preview->mVisible) preview->UpdateTaskbarProperties();
    }
  }
  return false;
}

TaskbarPreview* TaskbarPreview::sActivePreview = nullptr;

}  // namespace widget
}  // namespace mozilla

quality100%

¤ Dauer der Verarbeitung: 0.30 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.