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gecko-dev/layout/forms/nsGfxCheckboxControlFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the NPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsGfxCheckboxControlFrame.h"
#include "nsICheckButton.h"
#include "nsHTMLAtoms.h"
#include "nsHTMLParts.h"
#include "nsFormFrame.h"
#include "nsIFormControl.h"
#include "nsIContent.h"
#include "nsIComponentManager.h"
#include "nsHTMLAtoms.h"
#include "nsINameSpaceManager.h"
#include "nsIPresState.h"
#include "nsCSSRendering.h"
#ifdef ACCESSIBILITY
#include "nsIAccessibilityService.h"
#endif
#include "nsIServiceManager.h"
#include "nsIDOMNode.h"
//------------------------------------------------------------
nsresult
NS_NewGfxCheckboxControlFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
{
NS_PRECONDITION(aNewFrame, "null OUT ptr");
if (nsnull == aNewFrame) {
return NS_ERROR_NULL_POINTER;
}
nsGfxCheckboxControlFrame* it = new (aPresShell) nsGfxCheckboxControlFrame;
if (!it) {
return NS_ERROR_OUT_OF_MEMORY;
}
*aNewFrame = it;
return NS_OK;
}
//------------------------------------------------------------
// Initialize GFX-rendered state
nsGfxCheckboxControlFrame::nsGfxCheckboxControlFrame()
: mChecked(eOff),
mCheckButtonFaceStyle(nsnull)
{
}
nsGfxCheckboxControlFrame::~nsGfxCheckboxControlFrame()
{
NS_IF_RELEASE(mCheckButtonFaceStyle);
}
//----------------------------------------------------------------------
// nsISupports
//----------------------------------------------------------------------
// Frames are not refcounted, no need to AddRef
NS_IMETHODIMP
nsGfxCheckboxControlFrame::QueryInterface(const nsIID& aIID, void** aInstancePtr)
{
NS_ASSERTION(aInstancePtr, "QueryInterface requires a non-NULL destination!");
if ( !aInstancePtr )
return NS_ERROR_NULL_POINTER;
if (aIID.Equals(NS_GET_IID(nsIStatefulFrame))) {
*aInstancePtr = (void*)(nsIStatefulFrame*) this;
return NS_OK;
}
if (aIID.Equals(NS_GET_IID(nsICheckboxControlFrame))) {
*aInstancePtr = (void*) ((nsICheckboxControlFrame*) this);
return NS_OK;
}
return nsFormControlFrame::QueryInterface(aIID, aInstancePtr);
}
#ifdef ACCESSIBILITY
NS_IMETHODIMP nsGfxCheckboxControlFrame::GetAccessible(nsIAccessible** aAccessible)
{
nsCOMPtr<nsIAccessibilityService> accService = do_GetService("@mozilla.org/accessibilityService;1");
if (accService) {
nsIAccessible* acc = nsnull;
return accService->CreateHTMLCheckboxAccessible(NS_STATIC_CAST(nsIFrame*, this), aAccessible);
}
return NS_ERROR_FAILURE;
}
#endif
//--------------------------------------------------------------
NS_IMETHODIMP
nsGfxCheckboxControlFrame::SetCheckboxFaceStyleContext(nsIStyleContext *aCheckboxFaceStyleContext)
{
mCheckButtonFaceStyle = aCheckboxFaceStyleContext;
NS_ADDREF(mCheckButtonFaceStyle);
return NS_OK;
}
//------------------------------------------------------------
//
// Init
//
// We need to override this in order to see if we're a tristate checkbox.
//
NS_IMETHODIMP
nsGfxCheckboxControlFrame::Init(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsIStyleContext* aContext,
nsIFrame* aPrevInFlow)
{
nsFormControlFrame::Init ( aPresContext, aContent, aParent, aContext, aPrevInFlow );
// figure out if we're a tristate at the start. This may change later on once
// we've been running for a while, so more code is in AttributeChanged() to pick
// that up. Regardless, we need this check when initializing.
nsAutoString value;
nsresult res = mContent->GetAttr ( kNameSpaceID_None, GetTristateAtom(), value );
if ( res == NS_CONTENT_ATTR_HAS_VALUE )
mIsTristate = PR_TRUE;
// give the attribute a default value so it's always present, if we're a tristate
if ( IsTristateCheckbox() )
mContent->SetAttr ( kNameSpaceID_None, GetTristateValueAtom(), NS_ConvertASCIItoUCS2("0"), PR_FALSE );
return NS_OK;
}
//--------------------------------------------------------------
NS_IMETHODIMP
nsGfxCheckboxControlFrame::GetAdditionalStyleContext(PRInt32 aIndex,
nsIStyleContext** aStyleContext) const
{
NS_PRECONDITION(nsnull != aStyleContext, "null OUT parameter pointer");
if (aIndex < 0) {
return NS_ERROR_INVALID_ARG;
}
*aStyleContext = nsnull;
switch (aIndex) {
case NS_GFX_CHECKBOX_CONTROL_FRAME_FACE_CONTEXT_INDEX:
*aStyleContext = mCheckButtonFaceStyle;
NS_IF_ADDREF(*aStyleContext);
break;
default:
return NS_ERROR_INVALID_ARG;
}
return NS_OK;
}
//--------------------------------------------------------------
NS_IMETHODIMP
nsGfxCheckboxControlFrame::SetAdditionalStyleContext(PRInt32 aIndex,
nsIStyleContext* aStyleContext)
{
if (aIndex < 0) {
return NS_ERROR_INVALID_ARG;
}
switch (aIndex) {
case NS_GFX_CHECKBOX_CONTROL_FRAME_FACE_CONTEXT_INDEX:
NS_IF_RELEASE(mCheckButtonFaceStyle);
mCheckButtonFaceStyle = aStyleContext;
NS_IF_ADDREF(aStyleContext);
break;
}
return NS_OK;
}
//------------------------------------------------------------
//
// GetTristateAtom [static]
//
// Use a lazily instantiated static initialization scheme to create an atom that
// represents the attribute set when this should be a tri-state checkbox.
//
// Does NOT addref!
//
nsIAtom*
nsGfxCheckboxControlFrame :: GetTristateAtom ( )
{
return nsHTMLAtoms::moz_tristate;
}
//------------------------------------------------------------
//
// GetTristateValueAtom [static]
//
// Use a lazily instantiated static initialization scheme to create an atom that
// represents the attribute that holds the value when the button is a tri-state (since
// we can't use "checked").
//
// Does NOT addref!
//
nsIAtom*
nsGfxCheckboxControlFrame :: GetTristateValueAtom ( )
{
return nsHTMLAtoms::moz_tristatevalue;
}
//------------------------------------------------------------
//
// AttributeChanged
//
// Override to check for the attribute that determines if we're a normal or a
// tristate checkbox. If we notice a switch from one to the other, we need
// to adjust the proper attributes in the content model accordingly.
//
// Also, since the value of a tri-state is kept in a separate attribute (we
// can't use "checked" because it's a boolean), we have to notice it changing
// here.
//
NS_IMETHODIMP
nsGfxCheckboxControlFrame::AttributeChanged(nsIPresContext* aPresContext,
nsIContent* aChild,
PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aModType,
PRInt32 aHint)
{
if ( aAttribute == GetTristateAtom() ) {
nsAutoString value;
nsresult res = mContent->GetAttr ( kNameSpaceID_None, GetTristateAtom(), value );
PRBool isNowTristate = (res == NS_CONTENT_ATTR_HAS_VALUE);
if ( isNowTristate != mIsTristate )
SwitchModesWithEmergencyBrake(aPresContext, isNowTristate);
}
else if ( aAttribute == GetTristateValueAtom() ) {
// ignore this change if we're not a tri-state checkbox
if ( IsTristateCheckbox() ) {
nsAutoString value;
nsresult res = mContent->GetAttr ( kNameSpaceID_None, GetTristateValueAtom(), value );
if ( res == NS_CONTENT_ATTR_HAS_VALUE )
SetCheckboxControlFrameState(aPresContext, value);
}
}
else
return nsFormControlFrame::AttributeChanged(aPresContext, aChild, aNameSpaceID, aAttribute, aModType, aHint);
return NS_OK;
}
//------------------------------------------------------------
//
// InitializeControl
//
// Set the default checked state of the checkbox.
//
void
nsGfxCheckboxControlFrame::InitializeControl(nsIPresContext* aPresContext)
{
nsFormControlFrame::InitializeControl(aPresContext);
PRBool checked = PR_FALSE;
nsresult result = GetDefaultCheckState(&checked);
if (NS_CONTENT_ATTR_HAS_VALUE == result) {
SetCheckboxState (aPresContext, checked ? eOn : eOff );
}
}
//------------------------------------------------------------
void
nsGfxCheckboxControlFrame::PaintCheckBox(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer)
{
aRenderingContext.PushState();
float p2t;
aPresContext->GetScaledPixelsToTwips(&p2t);
nsMargin borderPadding(0,0,0,0);
CalcBorderPadding(borderPadding);
nsRect checkRect(0,0, mRect.width, mRect.height);
checkRect.Deflate(borderPadding);
const nsStyleColor* color = (const nsStyleColor*)
mStyleContext->GetStyleData(eStyleStruct_Color);
aRenderingContext.SetColor(color->mColor);
if ( IsTristateCheckbox() ) {
// Get current checked state through content model.
// XXX this won't work under printing. does that matter???
CheckState checked = GetCheckboxState();
switch ( checked ) {
case eOn:
nsFormControlHelper::PaintCheckMark(aRenderingContext, p2t, checkRect);
break;
case eMixed:
PaintMixedMark(aRenderingContext, p2t, checkRect);
break;
// no special drawing otherwise
default:
break;
} // case of value of checkbox
} else {
// Get current checked state through content model.
// XXX: This is very inefficient, but it is necessary in the case of printing.
// During printing the Paint is called but the actual state of the checkbox
// is in a frame in presentation shell 0.
PRBool checked = PR_FALSE;
GetCurrentCheckState(&checked);
if ( checked ) {
nsFormControlHelper::PaintCheckMark(aRenderingContext, p2t, checkRect);
}
}
PRBool clip;
aRenderingContext.PopState(clip);
}
//------------------------------------------------------------
//
// PaintMixedMark
//
// Like nsFormControlHelper::PaintCheckMark(), but paints the horizontal "mixed"
// bar inside the box. Only used for tri-state checkboxes.
//
void
nsGfxCheckboxControlFrame::PaintMixedMark ( nsIRenderingContext& aRenderingContext,
float aPixelsToTwips, const nsRect& aRect)
{
const PRUint32 checkpoints = 4;
const PRUint32 checksize = 6; //This is value is determined by added 2 units to the end
//of the 7X& pixel rectangle below to provide some white space
//around the checkmark when it is rendered.
// Points come from the coordinates on a 7X7 pixels
// box with 0,0 at the lower left.
nscoord checkedPolygonDef[] = { 1,2, 5,2, 5,4, 1,4 };
// Location of the center point of the checkmark
const PRUint32 centerx = 3;
const PRUint32 centery = 3;
nsPoint checkedPolygon[checkpoints];
PRUint32 defIndex = 0;
PRUint32 polyIndex = 0;
// Scale the checkmark based on the smallest dimension
PRUint32 size = aRect.width / checksize;
if (aRect.height < aRect.width)
size = aRect.height / checksize;
// Center and offset each point in the polygon definition.
for (defIndex = 0; defIndex < (checkpoints * 2); defIndex++) {
checkedPolygon[polyIndex].x = nscoord((((checkedPolygonDef[defIndex]) - centerx) * (size)) + (aRect.width / 2) + aRect.x);
defIndex++;
checkedPolygon[polyIndex].y = nscoord((((checkedPolygonDef[defIndex]) - centery) * (size)) + (aRect.height / 2) + aRect.y);
polyIndex++;
}
aRenderingContext.FillPolygon(checkedPolygon, checkpoints);
} // PaintMixedMark
//------------------------------------------------------------
NS_METHOD
nsGfxCheckboxControlFrame::Paint(nsIPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer,
PRUint32 aFlags)
{
PRBool isVisible;
if (NS_SUCCEEDED(IsVisibleForPainting(aPresContext, aRenderingContext, PR_TRUE, &isVisible)) && !isVisible) {
return NS_OK;
}
// Paint the background
nsFormControlFrame::Paint(aPresContext, aRenderingContext, aDirtyRect, aWhichLayer);
if (NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer) {
PRBool doDefaultPainting = PR_TRUE;
// Paint the checkmark
if (nsnull != mCheckButtonFaceStyle && GetCheckboxState() == eOn) {
const nsStyleBackground* myColor = (const nsStyleBackground*)
mCheckButtonFaceStyle->GetStyleData(eStyleStruct_Background);
if (myColor->mBackgroundImage.Length() > 0) {
const nsStyleBorder* myBorder = (const nsStyleBorder*)
mCheckButtonFaceStyle->GetStyleData(eStyleStruct_Border);
const nsStylePosition* myPosition = (const nsStylePosition*)
mCheckButtonFaceStyle->GetStyleData(eStyleStruct_Position);
nscoord width = myPosition->mWidth.GetCoordValue();
nscoord height = myPosition->mHeight.GetCoordValue();
// Position the button centered within the radio control's rectangle.
nscoord x = (mRect.width - width) / 2;
nscoord y = (mRect.height - height) / 2;
nsRect rect(x, y, width, height);
nsCSSRendering::PaintBackground(aPresContext, aRenderingContext, this,
aDirtyRect, rect, *myColor, *myBorder, 0, 0);
nsCSSRendering::PaintBorder(aPresContext, aRenderingContext, this,
aDirtyRect, rect, *myBorder, mCheckButtonFaceStyle, 0);
doDefaultPainting = PR_FALSE;
}
}
if (doDefaultPainting) {
PaintCheckBox(aPresContext, aRenderingContext, aDirtyRect, aWhichLayer);
}
}
// Call to the base class to draw selection borders when appropriate
return nsFrame::Paint(aPresContext, aRenderingContext, aDirtyRect, aWhichLayer);
}
//------------------------------------------------------------
nsGfxCheckboxControlFrame::CheckState
nsGfxCheckboxControlFrame::GetCheckboxState ( )
{
return mChecked;
}
//------------------------------------------------------------
void
nsGfxCheckboxControlFrame::SetCheckboxState (nsIPresContext* aPresContext,
nsGfxCheckboxControlFrame::CheckState aValue )
{
mChecked = aValue;
nsFormControlHelper::ForceDrawFrame(aPresContext, this);
}
//------------------------------------------------------------
void nsGfxCheckboxControlFrame::GetCheckboxControlFrameState(nsAWritableString& aValue)
{
CheckStateToString(GetCheckboxState(), aValue);
}
//------------------------------------------------------------
void nsGfxCheckboxControlFrame::SetCheckboxControlFrameState(nsIPresContext* aPresContext,
const nsAReadableString& aValue)
{
CheckState state = StringToCheckState(aValue);
SetCheckboxState(aPresContext, state);
}
//------------------------------------------------------------
NS_IMETHODIMP nsGfxCheckboxControlFrame::SetProperty(nsIPresContext* aPresContext,
nsIAtom* aName,
const nsAReadableString& aValue)
{
if (nsHTMLAtoms::checked == aName)
SetCheckboxControlFrameState(aPresContext, aValue);
else
return nsFormControlFrame::SetProperty(aPresContext, aName, aValue);
return NS_OK;
}
//------------------------------------------------------------
NS_IMETHODIMP nsGfxCheckboxControlFrame::GetProperty(nsIAtom* aName, nsAWritableString& aValue)
{
if (nsHTMLAtoms::checked == aName)
GetCheckboxControlFrameState(aValue);
else
return nsFormControlFrame::GetProperty(aName, aValue);
return NS_OK;
}
//------------------------------------------------------------
PRInt32
nsGfxCheckboxControlFrame::GetMaxNumValues()
{
return 1;
}
//------------------------------------------------------------
PRBool
nsGfxCheckboxControlFrame::GetNamesValues(PRInt32 aMaxNumValues, PRInt32& aNumValues,
nsString* aValues, nsString* aNames)
{
nsAutoString name;
nsresult nameResult = GetName(&name);
if ((aMaxNumValues <= 0) || (NS_CONTENT_ATTR_HAS_VALUE != nameResult)) {
return PR_FALSE;
}
PRBool result = PR_TRUE;
CheckState state = GetCheckboxState();
nsAutoString value;
nsresult valueResult = GetValue(&value);
if (eOn != state) {
result = PR_FALSE;
} else {
if (NS_CONTENT_ATTR_HAS_VALUE != valueResult) {
aValues[0].AssignWithConversion("on");
} else {
aValues[0] = value;
}
aNames[0] = name;
aNumValues = 1;
}
return result;
}
//------------------------------------------------------------
void
nsGfxCheckboxControlFrame::Reset(nsIPresContext* aPresContext)
{
PRBool checked;
GetDefaultCheckState(&checked);
SetCheckboxState (aPresContext, checked ? eOn : eOff );
}
//------------------------------------------------------------
//
// CheckStateToString
//
// Converts from a CheckState to a string
//
void
nsGfxCheckboxControlFrame::CheckStateToString ( CheckState inState, nsAWritableString& outStateAsString )
{
switch ( inState ) {
case eOn:
outStateAsString.Assign(NS_STRING_TRUE);
break;
case eOff:
outStateAsString.Assign(NS_STRING_FALSE);
break;
case eMixed:
outStateAsString.Assign(NS_LITERAL_STRING("2"));
break;
}
} // CheckStateToString
//------------------------------------------------------------
//
// StringToCheckState
//
// Converts from a string to a CheckState enum
//
nsGfxCheckboxControlFrame::CheckState
nsGfxCheckboxControlFrame::StringToCheckState ( const nsAReadableString & aStateAsString )
{
if ( aStateAsString.Equals(NS_STRING_TRUE) )
return eOn;
else if ( aStateAsString.Equals(NS_STRING_FALSE) )
return eOff;
// not true and not false means mixed
return eMixed;
} // StringToCheckState
//------------------------------------------------------------
//
// SwitchModesWithEmergencyBrake
//
// Since we use an attribute to decide if we're a tristate box or not, this can change
// at any time. Since we have to use separate attributes to store the values depending
// on the mode, we have to convert from one to the other.
//
void
nsGfxCheckboxControlFrame::SwitchModesWithEmergencyBrake ( nsIPresContext* aPresContext,
PRBool inIsNowTristate )
{
if ( inIsNowTristate ) {
// we were a normal checkbox, and now we're a tristate. That means that the
// state of the checkbox was in "checked" and needs to be copied over into
// our parallel attribute.
nsAutoString value;
CheckStateToString ( GetCheckboxState(), value );
mContent->SetAttr ( kNameSpaceID_None, GetTristateValueAtom(), value, PR_FALSE );
}
else {
// we were a tri-state checkbox, and now we're a normal checkbox. The current
// state is already up to date (because it's always up to date). We just have
// to make sure it's not mixed. If it is, just set it to checked. Remove our
// parallel attribute so that we're nice and HTML4 compliant.
if ( GetCheckboxState() == eMixed )
SetCheckboxState(aPresContext, eOn);
mContent->UnsetAttr ( kNameSpaceID_None, GetTristateValueAtom(), PR_FALSE );
}
// switch!
mIsTristate = inIsNowTristate;
} // SwitchModesWithEmergencyBrake
//----------------------------------------------------------------------
// nsIStatefulFrame
//----------------------------------------------------------------------
NS_IMETHODIMP nsGfxCheckboxControlFrame::SaveState(nsIPresContext* aPresContext,
nsIPresState** aState)
{
NS_ENSURE_ARG_POINTER(aState);
// Don't save state before we are initialized
if (!mDidInit) {
return NS_OK;
}
CheckState stateCheck = GetCheckboxState();
PRBool defaultStateBool = PR_FALSE;
nsresult res = GetDefaultCheckState(&defaultStateBool);
// Compare to default value, and only save if needed (Bug 62713)
// eOn/eOff comparisons used to handle 'mixed' state (alway save)
if (!(NS_CONTENT_ATTR_HAS_VALUE == res &&
((eOn == stateCheck && defaultStateBool) ||
(eOff == stateCheck && !defaultStateBool)))) {
// Get the value string
nsAutoString stateString;
CheckStateToString(stateCheck, stateString);
// Construct a pres state and store value in it.
res = NS_NewPresState(aState);
NS_ENSURE_SUCCESS(res, res);
res = (*aState)->SetStateProperty(NS_LITERAL_STRING("checked"), stateString);
}
return res;
}
NS_IMETHODIMP nsGfxCheckboxControlFrame::RestoreState(nsIPresContext* aPresContext,
nsIPresState* aState)
{
NS_ENSURE_ARG_POINTER(aState);
if (!mDidInit) {
mPresContext = aPresContext;
InitializeControl(aPresContext);
mDidInit = PR_TRUE;
}
// Set the value to the stored state.
nsAutoString stateString;
nsresult res = aState->GetStateProperty(NS_LITERAL_STRING("checked"), stateString);
NS_ENSURE_SUCCESS(res, res);
SetCheckboxControlFrameState(aPresContext, stateString);
return NS_OK;
}
//------------------------------------------------------------
// Extra Debug Methods
//------------------------------------------------------------
#ifdef DEBUG_rodsXXX
NS_IMETHODIMP
nsGfxCheckboxControlFrame::Reflow(nsIPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsGfxCheckboxControlFrame", aReflowState.reason);
nsresult rv = nsFormControlFrame::Reflow(aPresContext, aDesiredSize, aReflowState, aStatus);
COMPARE_QUIRK_SIZE("nsGfxCheckboxControlFrame", 13, 13)
return rv;
}
#endif
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