gecko-dev/layout/forms/nsGfxCheckboxControlFrame.cpp

561 lines
18 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#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"
//------------------------------------------------------------
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)
{
}
//----------------------------------------------------------------------
// 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;
}
return nsFormControlFrame::QueryInterface(aIID, aInstancePtr);
}
//------------------------------------------------------------
//
// 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->GetAttribute ( 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->SetAttribute ( kNameSpaceID_None, GetTristateValueAtom(), "0", PR_FALSE );
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 aHint)
{
if ( aAttribute == GetTristateAtom() ) {
nsAutoString value;
nsresult res = mContent->GetAttribute ( 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->GetAttribute ( kNameSpaceID_None, GetTristateValueAtom(), value );
if ( res == NS_CONTENT_ATTR_HAS_VALUE )
SetCheckboxControlFrameState(aPresContext, value);
}
}
else
return nsFormControlFrame::AttributeChanged(aPresContext, aChild, aNameSpaceID, aAttribute, 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);
const nsStyleSpacing* spacing =
(const nsStyleSpacing*)mStyleContext->GetStyleData(eStyleStruct_Spacing);
nsRect checkRect(0,0, mRect.width, mRect.height);
nsMargin borderPadding;
spacing->CalcBorderPaddingFor(this, borderPadding);
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)
{
const nsStyleDisplay* disp = (const nsStyleDisplay*)
mStyleContext->GetStyleData(eStyleStruct_Display);
if (!disp->IsVisible())
return NS_OK;
// Paint the background
nsFormControlFrame::Paint(aPresContext, aRenderingContext, aDirtyRect, aWhichLayer);
if (NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer) {
// Paint the checkmark
PaintCheckBox(aPresContext, aRenderingContext, aDirtyRect, aWhichLayer);
}
return NS_OK;
}
//------------------------------------------------------------
nsGfxCheckboxControlFrame::CheckState
nsGfxCheckboxControlFrame::GetCheckboxState ( )
{
return mChecked;
}
//------------------------------------------------------------
void
nsGfxCheckboxControlFrame::SetCheckboxState (nsIPresContext* aPresContext,
nsGfxCheckboxControlFrame::CheckState aValue )
{
mChecked = aValue;
nsFormControlHelper::ForceDrawFrame(aPresContext, this);
}
//------------------------------------------------------------
void nsGfxCheckboxControlFrame::GetCheckboxControlFrameState(nsString& aValue)
{
CheckStateToString(GetCheckboxState(), aValue);
}
//------------------------------------------------------------
void nsGfxCheckboxControlFrame::SetCheckboxControlFrameState(nsIPresContext* aPresContext,
const nsString& aValue)
{
CheckState state = StringToCheckState(aValue);
SetCheckboxState(aPresContext, state);
}
//------------------------------------------------------------
NS_IMETHODIMP nsGfxCheckboxControlFrame::SetProperty(nsIPresContext* aPresContext,
nsIAtom* aName,
const nsString& aValue)
{
if (nsHTMLAtoms::checked == aName)
SetCheckboxControlFrameState(aPresContext, aValue);
else
return nsFormControlFrame::SetProperty(aPresContext, aName, aValue);
return NS_OK;
}
//------------------------------------------------------------
NS_IMETHODIMP nsGfxCheckboxControlFrame::GetProperty(nsIAtom* aName, nsString& 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] = "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, nsString& outStateAsString )
{
switch ( inState ) {
case eOn:
outStateAsString = NS_STRING_TRUE;
break;
case eOff:
outStateAsString = NS_STRING_FALSE;
break;
case eMixed:
outStateAsString = "2";
break;
}
} // CheckStateToString
//------------------------------------------------------------
//
// StringToCheckState
//
// Converts from a string to a CheckState enum
//
nsGfxCheckboxControlFrame::CheckState
nsGfxCheckboxControlFrame::StringToCheckState ( const nsString & aStateAsString )
{
if ( aStateAsString == NS_STRING_TRUE )
return eOn;
else if ( aStateAsString == 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->SetAttribute ( 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->UnsetAttribute ( kNameSpaceID_None, GetTristateValueAtom(), PR_FALSE );
}
// switch!
mIsTristate = inIsNowTristate;
} // SwitchModesWithEmergencyBrake
//----------------------------------------------------------------------
// nsIStatefulFrame
//----------------------------------------------------------------------
NS_IMETHODIMP nsGfxCheckboxControlFrame::GetStateType(nsIPresContext* aPresContext,
nsIStatefulFrame::StateType* aStateType)
{
*aStateType=nsIStatefulFrame::eCheckboxType;
return NS_OK;
}
NS_IMETHODIMP nsGfxCheckboxControlFrame::SaveState(nsIPresContext* aPresContext,
nsIPresState** aState)
{
// Construct a pres state.
NS_NewPresState(aState); // The addref happens here.
// This string will hold a single item, whether or not we're checked.
nsAutoString stateString;
GetCheckboxControlFrameState(stateString);
(*aState)->SetStateProperty("checked", stateString);
return NS_OK;
}
NS_IMETHODIMP nsGfxCheckboxControlFrame::RestoreState(nsIPresContext* aPresContext,
nsIPresState* aState)
{
if (!mDidInit) {
mPresContext = aPresContext;
InitializeControl(aPresContext);
mDidInit = PR_TRUE;
}
nsAutoString string;
aState->GetStateProperty("checked", string);
SetCheckboxControlFrameState(aPresContext, string);
return NS_OK;
}
//------------------------------------------------------------
// Extra Debug Methods
//------------------------------------------------------------
#ifdef DEBUG_rodsXXX
NS_IMETHODIMP
nsGfxCheckboxControlFrame::Reflow(nsIPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
nsresult rv = nsFormControlFrame::Reflow(aPresContext, aDesiredSize, aReflowState, aStatus);
COMPARE_QUIRK_SIZE("nsGfxCheckboxControlFrame", 13, 13)
return rv;
}
#endif