mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-13 18:27:35 +00:00
122 lines
4.1 KiB
C++
122 lines
4.1 KiB
C++
/* -*- 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/. */
|
|
|
|
#ifndef mozilla_StyleStructContext_h
|
|
#define mozilla_StyleStructContext_h
|
|
|
|
#include "CounterStyleManager.h"
|
|
#include "mozilla/LookAndFeel.h"
|
|
#include "nsPresContext.h"
|
|
|
|
class nsDeviceContext;
|
|
|
|
/**
|
|
* Construction context for style structs.
|
|
*
|
|
* Certain Gecko style structs have historically taken an nsPresContext
|
|
* argument in their constructor, which is used to compute various things. This
|
|
* makes Gecko style structs document-specific (which Servo style structs are
|
|
* not), and means that the initial values for style-structs cannot be shared
|
|
* across the entire runtime (as is the case in Servo).
|
|
*
|
|
* We'd like to remove this constraint so that Gecko can get the benefits of the
|
|
* Servo model, and so that Gecko aligns better with the Servo style system when
|
|
* using it. Unfortunately, this may require a fair amount of work, especially
|
|
* related to text zoom.
|
|
*
|
|
* So as an intermediate step, we define a reduced API set of "things that are
|
|
* needed when constructing style structs". This just wraps and forwards to an
|
|
* nsPresContext in the Gecko case, and returns some default not-always-correct
|
|
* values in the Servo case. We can then focus on reducing this API surface to
|
|
* zero, at which point this can be removed.
|
|
*
|
|
* We don't put the type in namespace mozilla, since we expect it to be
|
|
* temporary, and the namespacing would clutter up nsStyleStruct.h.
|
|
*/
|
|
#ifdef MOZ_STYLO
|
|
#define SERVO_DEFAULT(default_val) { if (!mPresContext) { return default_val; } }
|
|
#else
|
|
#define SERVO_DEFAULT(default_val) { MOZ_ASSERT(mPresContext); }
|
|
#endif
|
|
class StyleStructContext {
|
|
public:
|
|
MOZ_IMPLICIT StyleStructContext(nsPresContext* aPresContext)
|
|
: mPresContext(aPresContext) { MOZ_ASSERT(aPresContext); }
|
|
static StyleStructContext ServoContext() { return StyleStructContext(); }
|
|
|
|
// XXXbholley: Need to make text zoom work with stylo. This probably means
|
|
// moving the zoom handling out of computed values and into a post-
|
|
// computation.
|
|
float TextZoom()
|
|
{
|
|
SERVO_DEFAULT(1.0);
|
|
return mPresContext->TextZoom();
|
|
}
|
|
|
|
const nsFont* GetDefaultFont(uint8_t aFontID)
|
|
{
|
|
// NB: The servo case only differ from the default case in terms of which
|
|
// font pref cache gets used. The distinction is probably unnecessary.
|
|
SERVO_DEFAULT(mozilla::StaticPresData::Get()->
|
|
GetDefaultFont(aFontID, GetLanguageFromCharset()));
|
|
return mPresContext->GetDefaultFont(aFontID, GetLanguageFromCharset());
|
|
}
|
|
|
|
uint32_t GetBidi()
|
|
{
|
|
SERVO_DEFAULT(0);
|
|
return mPresContext->GetBidi();
|
|
}
|
|
|
|
int32_t AppUnitsPerDevPixel();
|
|
|
|
nscoord DevPixelsToAppUnits(int32_t aPixels)
|
|
{
|
|
return NSIntPixelsToAppUnits(aPixels, AppUnitsPerDevPixel());
|
|
}
|
|
|
|
typedef mozilla::LookAndFeel LookAndFeel;
|
|
nscolor DefaultColor()
|
|
{
|
|
SERVO_DEFAULT(LookAndFeel::GetColor(LookAndFeel::eColorID_WindowForeground,
|
|
NS_RGB(0x00, 0x00, 0x00)));
|
|
return mPresContext->DefaultColor();
|
|
}
|
|
|
|
mozilla::CounterStyle* BuildCounterStyle(const nsSubstring& aName)
|
|
{
|
|
SERVO_DEFAULT(mozilla::CounterStyleManager::GetBuiltinStyle(NS_STYLE_LIST_STYLE_DISC));
|
|
return mPresContext->CounterStyleManager()->BuildCounterStyle(aName);
|
|
}
|
|
|
|
nsIAtom* GetLanguageFromCharset() const
|
|
{
|
|
SERVO_DEFAULT(nsGkAtoms::x_western);
|
|
return mPresContext->GetLanguageFromCharset();
|
|
}
|
|
|
|
already_AddRefed<nsIAtom> GetContentLanguage() const
|
|
{
|
|
SERVO_DEFAULT(do_AddRef(nsGkAtoms::x_western));
|
|
return mPresContext->GetContentLanguage();
|
|
}
|
|
|
|
private:
|
|
nsDeviceContext* DeviceContext()
|
|
{
|
|
SERVO_DEFAULT(HackilyFindSomeDeviceContext());
|
|
return mPresContext->DeviceContext();
|
|
}
|
|
|
|
nsDeviceContext* HackilyFindSomeDeviceContext();
|
|
|
|
StyleStructContext() : mPresContext(nullptr) {}
|
|
nsPresContext* mPresContext;
|
|
};
|
|
|
|
#undef SERVO_DEFAULT
|
|
|
|
#endif // mozilla_StyleStructContext_h
|