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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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
#ifndef mozilla_MozPrintCallbackRunner_h
#define mozilla_MozPrintCallbackRunner_h
#include "nsTArray.h"
class nsIFrame;
class nsITimerCallback;
namespace mozilla {
namespace dom {
class HTMLCanvasElement;
}
namespace gfx {
class DrawTarget;
}
// Runs the mozPrintCallback of the <canvas> elements in a frame tree that is
// being printed, and keeps track of their completion.
class MozPrintCallbackRunner final {
public:
MozPrintCallbackRunner();
MozPrintCallbackRunner(MozPrintCallbackRunner&&);
~MozPrintCallbackRunner();
// Collects the <canvas> elements with a mozPrintCallback in aFrame's
// subtree, recursing across in-process subdocs.
void CollectCanvases(nsIFrame* aFrame);
bool HasCanvases() const { return !mCanvases.IsEmpty(); }
// Redirects each canvas' drawing to a recording draw target created from
// aReferenceDt and dispatches its mozPrintCallback. aCallback is notified
// with `nullptr` each time one of the callbacks finishes.
void DispatchCallbacks(gfx::DrawTarget* aReferenceDt,
nsITimerCallback* aCallback);
bool AreCallbacksDone() const;
// Resets the print state of the canvases and forgets about them.
void Reset();
private:
nsTArray<RefPtr<dom::HTMLCanvasElement>> mCanvases;
};
} // namespace mozilla
#endif // mozilla_MozPrintCallbackRunner_h