2009-03-25  Darin Adler  <darin@apple.com>

        Reviewed by David Hyatt.

        Bug 24740: crash in RenderSlider::setPositionFromValue when calling pause() after setting <video> to display: none
        https://bugs.webkit.org/show_bug.cgi?id=24740
        rdar://problem/6679873

        Bug 12104: Native Slider: When the thumb's height is specified as a percentage, it is not centered properly
        https://bugs.webkit.org/show_bug.cgi?id=12104

        Test: media/video-display-none-crash.html

        The problem here was that RenderSlider was trying to position its thumb in a way that
        requires it to call updateLayout inside rendering code. The right way to position a
        child renderer is to do layout, so I had to write a layout function. And then fix a few
        other small problems shown by the same test case.

        * rendering/RenderSlider.cpp: Made defaultTrackLength have internal linkage.
        Renamed HTMLSliderThumbElement to SliderThumbElement because we only use the HTML
        prefix for public DOM classes, not elements used as implementation details.
        Made SliderThumbElement function members private and got rid of unneeded default
        argument value for shadowParent.
        (WebCore::SliderRange::SliderRange): Added. Parses precision, max, and min attributes.
        (WebCore::SliderRange::clampValue): Added. Does standard clamping based on the above.
        (WebCore::SliderRange::valueFromElement): Added. Reads the value from the element in
        a way that clamps to the range.
        (WebCore::sliderPosition): Added. Computes the slider position: a double.
        (WebCore::SliderThumbElement::SliderThumbElement): Removed unneeded explicit
        initialization of m_initialClickPoint.
        (WebCore::SliderThumbElement::defaultEventHandler): Call setValueForPosition instead
        of calling setCurrentPosition and valueChanged.
        (WebCore::RenderSlider::RenderSlider): Remove unneeded explicit initialization of m_thumb.
        (WebCore::RenderSlider::styleDidChange): Remove unneeded second argument to createThumbStyle.
        (WebCore::RenderSlider::createThumbStyle): Remove unneeded second argument. Get rid of code
        setting the position to relative and setting the left and top. We now handle positioning
        in a custom layout function.
        (WebCore::RenderSlider::layout): Rewrote to handle positioning of the thumb as layout.
        (WebCore::RenderSlider::updateFromElement): Added code to immediately update the value
        in the element if it's out of range. This clamping used to be done as a side effect of
        setPositionFromValue. Also, this has nothing to do with the renderer, so at some point
        it could be moved into HTMLInputElement. Removed call to setPositionFromValue
        and instead just rely on the call to setNeedsLayout. Fix the setNeedsLayout call to be
        a normal setNeedsLayout(true), not a setNeedsLayout(true, false), because we do want
        this to be propagated to the parent -- it's not called during layout.
        (WebCore::RenderSlider::setValueForPosition): Refactor to use the new SliderRange
        class. Also don't call setCurrentPosition; instead just call setNeedsLayout.
        (WebCore::RenderSlider::currentPosition): Use the actual position of the renderer rather
        than the style to find the position; that means this needs to be done after layout is done.
        Also removed unneeded runtime checks and replaced them with assertions, after checking
        all callers to see they already guarantee this.
        (WebCore::RenderSlider::trackSize): Removed unneeded runtime checks and replaced them
        with assertions, after checking all callers to see they already guarantee this.
        (WebCore::RenderSlider::inDragMode): Added a null check for m_thumb so this won't
        crash if called early on a brand new RenderSlider.

        * rendering/RenderSlider.h: Made all functions private except for forwardEvent and inDragMode.
        Renamed HTMLSliderThumbElement to SliderThumbElement because we only use the HTML
        prefix for public DOM classes, not elements used as implementation details. Made the
        mouseEventIsInThumb function non-virtual. Removed the return value and argument from
        setPositionFromValue. Removed valueChanged and setCurrentPosition. Removed the oldStyle
        argument to createThumbStyle (see above). Made SliderThumbElement a friend so it can use some
        private member functions.

LayoutTests:

2009-03-25  Darin Adler  <darin@apple.com>

        Reviewed by David Hyatt.

        Bug 24740: crash in RenderSlider::setPositionFromValue when calling pause() after setting <video> to display: none
        https://bugs.webkit.org/show_bug.cgi?id=24740
        rdar://problem/6679873

        Bug 12104: Native Slider: When the thumb's height is specified as a percentage, it is not centered properly
        https://bugs.webkit.org/show_bug.cgi?id=12104

        * media/video-display-none-crash-expected.txt: Added.
        * media/video-display-none-crash.html: Added.

        * platform/mac/fast/forms/box-shadow-override-expected.txt: Updated since a slider's thumb is no longer
        relative-positioned and hence no longer gets its own layer.
        * platform/mac/fast/forms/input-appearance-height-expected.txt: Ditto.
        * platform/mac/fast/forms/slider-padding-expected.txt: Ditto.
        * platform/mac/fast/forms/slider-thumb-shared-style-expected.txt: Ditto.
        * platform/mac/fast/forms/slider-thumb-stylability-expected.txt: Ditto.
        * platform/mac/media/audio-controls-rendering-expected.txt: Ditto.
        * platform/mac/media/video-controls-rendering-expected.txt: Ditto.
        * platform/mac/media/video-display-toggle-expected.txt: Ditto.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@41972 268f45cc-cd09-0410-ab3c-d52691b4dbfc