450 lines
13 KiB
C++
450 lines
13 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#include "nsCheckboxControlFrame.h"
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#include "nsICheckButton.h"
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#include "nsNativeFormControlFrame.h"
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#include "nsWidgetsCID.h"
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#include "nsIContent.h"
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#include "nsHTMLAtoms.h"
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#include "nsCOMPtr.h"
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#include "nsINameSpaceManager.h"
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#include "nsFormFrame.h"
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#include "nsIStatefulFrame.h"
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#include "nsIPresState.h"
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#include "nsISupportsPrimitives.h"
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#include "nsIComponentManager.h"
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//----------------------------------------------------------------------
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// nsISupports
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//----------------------------------------------------------------------
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// Frames are not refcounted, no need to AddRef
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NS_IMETHODIMP
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nsCheckboxControlFrame::QueryInterface(const nsIID& aIID, void** aInstancePtr)
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{
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NS_ASSERTION(aInstancePtr, "QueryInterface requires a non-NULL destination!");
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if ( !aInstancePtr )
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return NS_ERROR_NULL_POINTER;
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if (aIID.Equals(NS_GET_IID(nsIStatefulFrame))) {
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*aInstancePtr = (void*)(nsIStatefulFrame*) this;
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return NS_OK;
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}
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return nsFormControlFrame::QueryInterface(aIID, aInstancePtr);
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}
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//
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// GetTristateAtom [static]
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//
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// Use a lazily instantiated static initialization scheme to create an atom that
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// represents the attribute set when this should be a tri-state checkbox.
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//
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// Does NOT addref!
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//
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nsIAtom*
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nsCheckboxControlFrame :: GetTristateAtom ( )
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{
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return nsHTMLAtoms::moz_tristate;
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}
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//
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// GetTristateValueAtom [static]
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//
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// Use a lazily instantiated static initialization scheme to create an atom that
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// represents the attribute that holds the value when the button is a tri-state (since
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// we can't use "checked").
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//
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// Does NOT addref!
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//
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nsIAtom*
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nsCheckboxControlFrame :: GetTristateValueAtom ( )
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{
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return nsHTMLAtoms::moz_tristatevalue;
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}
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//
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// Constructor
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//
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nsCheckboxControlFrame :: nsCheckboxControlFrame ( )
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: mIsTristate(PR_FALSE)
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{
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}
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//
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// Init
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//
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// We need to override this in order to see if we're a tristate checkbox.
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//
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NS_IMETHODIMP
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nsCheckboxControlFrame::Init(nsIPresContext* aPresContext,
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nsIContent* aContent,
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nsIFrame* aParent,
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nsIStyleContext* aContext,
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nsIFrame* aPrevInFlow)
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{
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nsNativeFormControlFrame::Init ( aPresContext, aContent, aParent, aContext, aPrevInFlow );
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// figure out if we're a tristate at the start. This may change later on once
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// we've been running for a while, so more code is in AttributeChanged() to pick
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// that up. Regardless, we need this check when initializing.
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nsAutoString value;
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nsresult res = mContent->GetAttribute ( kNameSpaceID_None, GetTristateAtom(), value );
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if ( res == NS_CONTENT_ATTR_HAS_VALUE )
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mIsTristate = PR_TRUE;
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// give the attribute a default value so it's always present, if we're a tristate
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if ( IsTristateCheckbox() )
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mContent->SetAttribute ( kNameSpaceID_None, GetTristateValueAtom(), "0", PR_FALSE );
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return NS_OK;
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}
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/*
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* FIXME: this ::GetIID() method has no meaning in life and should be
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* removed.
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* Pierre Phaneuf <pp@ludusdesign.com>
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*/
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const nsIID&
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nsCheckboxControlFrame::GetIID()
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{
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static NS_DEFINE_IID(kCheckboxIID, NS_ICHECKBUTTON_IID);
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return kCheckboxIID;
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}
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const nsIID&
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nsCheckboxControlFrame::GetCID()
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{
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static NS_DEFINE_IID(kCheckboxCID, NS_CHECKBUTTON_CID);
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return kCheckboxCID;
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}
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//
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// PostCreateWidget
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//
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// Set the default checked state of the checkbox.
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//
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void
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nsCheckboxControlFrame::PostCreateWidget(nsIPresContext* aPresContext, nscoord& aWidth, nscoord& aHeight)
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{
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PRBool checked = PR_FALSE;
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nsresult result = GetDefaultCheckState(&checked);
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if (NS_CONTENT_ATTR_HAS_VALUE == result)
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SetCheckboxState (aPresContext, checked ? eOn : eOff );
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}
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//
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// AttributeChanged
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//
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// Override to check for the attribute that determines if we're a normal or a
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// tristate checkbox. If we notice a switch from one to the other, we need
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// to adjust the proper attributes in the content model accordingly.
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//
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// Also, since the value of a tri-state is kept in a separate attribute (we
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// can't use "checked" because it's a boolean), we have to notice it changing
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// here.
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//
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NS_IMETHODIMP
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nsCheckboxControlFrame::AttributeChanged(nsIPresContext* aPresContext,
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nsIContent* aChild,
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PRInt32 aNameSpaceID,
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nsIAtom* aAttribute,
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PRInt32 aHint)
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{
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if ( aAttribute == GetTristateAtom() ) {
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nsAutoString value;
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nsresult res = mContent->GetAttribute ( kNameSpaceID_None, GetTristateAtom(), value );
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PRBool isNowTristate = (res == NS_CONTENT_ATTR_HAS_VALUE);
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if ( isNowTristate != mIsTristate )
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SwitchModesWithEmergencyBrake(aPresContext, isNowTristate);
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}
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else if ( aAttribute == GetTristateValueAtom() ) {
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// ignore this change if we're not a tri-state checkbox
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if ( IsTristateCheckbox() ) {
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nsAutoString value;
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nsresult res = mContent->GetAttribute ( kNameSpaceID_None, GetTristateValueAtom(), value );
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if ( res == NS_CONTENT_ATTR_HAS_VALUE )
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SetCheckboxControlFrameState(aPresContext, value);
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}
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}
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else
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return nsNativeFormControlFrame::AttributeChanged(aPresContext, aChild, aNameSpaceID, aAttribute, aHint);
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return NS_OK;
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}
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void
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nsCheckboxControlFrame::MouseUp(nsIPresContext* aPresContext)
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{
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if ( IsTristateCheckbox() ) {
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CheckState newState = eOn;
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switch ( GetCheckboxState() ) {
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case eOn:
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newState = eOff;
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break;
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case eMixed:
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newState = eOn;
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break;
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case eOff:
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newState = eMixed;
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break;
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}
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SetCheckboxState(aPresContext, newState);
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// Keep the tri-state stuff on the content node current. No need to force an
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// attribute changed event since we just set the state of the checkbox ourselves.
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nsAutoString value;
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CheckStateToString ( newState, value );
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mContent->SetAttribute ( kNameSpaceID_None, GetTristateValueAtom(), value, PR_FALSE );
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}
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else {
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CheckState newState = GetCheckboxState() == eOn ? eOff : eOn;
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SetCheckboxState(aPresContext, newState);
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}
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}
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PRInt32
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nsCheckboxControlFrame::GetMaxNumValues()
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{
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return 1;
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}
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PRBool
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nsCheckboxControlFrame::GetNamesValues(PRInt32 aMaxNumValues, PRInt32& aNumValues,
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nsString* aValues, nsString* aNames)
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{
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nsAutoString name;
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nsresult nameResult = GetName(&name);
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if ((aMaxNumValues <= 0) || (NS_CONTENT_ATTR_HAS_VALUE != nameResult)) {
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return PR_FALSE;
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}
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PRBool result = PR_TRUE;
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CheckState state = GetCheckboxState();
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nsAutoString value;
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nsresult valueResult = GetValue(&value);
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if (eOn != state) {
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result = PR_FALSE;
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} else {
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if (NS_CONTENT_ATTR_HAS_VALUE != valueResult) {
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aValues[0] = "on";
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} else {
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aValues[0] = value;
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}
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aNames[0] = name;
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aNumValues = 1;
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}
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return result;
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}
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void
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nsCheckboxControlFrame::Reset(nsIPresContext* aPresContext)
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{
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PRBool checked;
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GetDefaultCheckState(&checked);
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SetCheckboxState (aPresContext, checked ? eOn : eOff );
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}
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NS_METHOD nsCheckboxControlFrame::HandleEvent(nsIPresContext* aPresContext,
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nsGUIEvent* aEvent,
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nsEventStatus* aEventStatus)
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{
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NS_ENSURE_ARG_POINTER(aEventStatus);
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if (nsEventStatus_eConsumeNoDefault == *aEventStatus)
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return NS_OK;
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if (nsFormFrame::GetDisabled(this))
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return NS_OK;
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if (NS_MOUSE_LEFT_BUTTON_UP == aEvent->message) {
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MouseUp(aPresContext);
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}
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return(nsNativeFormControlFrame::HandleEvent(aPresContext, aEvent, aEventStatus));
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}
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void nsCheckboxControlFrame::GetCheckboxControlFrameState(nsString& aValue)
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{
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CheckStateToString(GetCheckboxState(), aValue);
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}
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void nsCheckboxControlFrame::SetCheckboxControlFrameState(nsIPresContext* aPresContext,
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const nsString& aValue)
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{
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CheckState state = StringToCheckState(aValue);
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SetCheckboxState(aPresContext, state);
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}
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NS_IMETHODIMP nsCheckboxControlFrame::SetProperty(nsIPresContext* aPresContext,
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nsIAtom* aName,
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const nsAReadableString& aValue)
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{
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if (nsHTMLAtoms::checked == aName)
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SetCheckboxControlFrameState(aPresContext, aValue);
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else
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return nsNativeFormControlFrame::SetProperty(aPresContext, aName, aValue);
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return NS_OK;
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}
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NS_IMETHODIMP nsCheckboxControlFrame::GetProperty(nsIAtom* aName, nsAReadableString& aValue)
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{
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if (nsHTMLAtoms::checked == aName)
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GetCheckboxControlFrameState(aValue);
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else
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return nsNativeFormControlFrame::GetProperty(aName, aValue);
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return NS_OK;
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}
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nsresult nsCheckboxControlFrame::RequiresWidget(PRBool& aRequiresWidget)
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{
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aRequiresWidget = PR_FALSE;
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return NS_OK;
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}
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//
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// CheckStateToString
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//
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// Converts from a CheckState to a string
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//
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void
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nsCheckboxControlFrame :: CheckStateToString ( CheckState inState, nsString& outStateAsString )
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{
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switch ( inState ) {
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case eOn:
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outStateAsString = NS_STRING_TRUE;
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break;
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case eOff:
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outStateAsString = NS_STRING_FALSE;
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break;
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case eMixed:
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outStateAsString = "2";
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break;
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}
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} // CheckStateToString
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//
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// StringToCheckState
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//
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// Converts from a string to a CheckState enum
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//
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nsCheckboxControlFrame::CheckState
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nsCheckboxControlFrame :: StringToCheckState ( const nsString & aStateAsString )
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{
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if ( aStateAsString == NS_STRING_TRUE )
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return eOn;
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else if ( aStateAsString == NS_STRING_FALSE )
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return eOff;
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// not true and not false means mixed
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return eMixed;
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} // StringToCheckState
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//
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// SwitchModesWithEmergencyBrake
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//
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// Since we use an attribute to decide if we're a tristate box or not, this can change
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// at any time. Since we have to use separate attributes to store the values depending
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// on the mode, we have to convert from one to the other.
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//
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void
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nsCheckboxControlFrame :: SwitchModesWithEmergencyBrake ( nsIPresContext* aPresContext,
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PRBool inIsNowTristate )
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{
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if ( inIsNowTristate ) {
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// we were a normal checkbox, and now we're a tristate. That means that the
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// state of the checkbox was in "checked" and needs to be copied over into
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// our parallel attribute.
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nsAutoString value;
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CheckStateToString ( GetCheckboxState(), value );
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mContent->SetAttribute ( kNameSpaceID_None, GetTristateValueAtom(), value, PR_FALSE );
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}
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else {
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// we were a tri-state checkbox, and now we're a normal checkbox. The current
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// state is already up to date (because it's always up to date). We just have
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// to make sure it's not mixed. If it is, just set it to checked. Remove our
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// parallel attribute so that we're nice and HTML4 compliant.
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if ( GetCheckboxState() == eMixed )
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SetCheckboxState(aPresContext, eOn);
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mContent->UnsetAttribute ( kNameSpaceID_None, GetTristateValueAtom(), PR_FALSE );
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}
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// switch!
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mIsTristate = inIsNowTristate;
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} // SwitchModesWithEmergencyBrake
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//----------------------------------------------------------------------
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// nsIStatefulFrame
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//----------------------------------------------------------------------
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NS_IMETHODIMP nsCheckboxControlFrame::GetStateType(nsIPresContext* aPresContext,
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nsIStatefulFrame::StateType* aStateType)
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{
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*aStateType=nsIStatefulFrame::eCheckboxType;
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return NS_OK;
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}
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NS_IMETHODIMP nsCheckboxControlFrame::SaveState(nsIPresContext* aPresContext,
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nsIPresState** aState)
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{
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// Construct a pres state.
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NS_NewPresState(aState); // The addref happens here.
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// This string will hold a single item, whether or not we're checked.
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nsAutoString stateString;
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GetCheckboxControlFrameState(stateString);
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(*aState)->SetStateProperty("checked", stateString);
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return NS_OK;
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}
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NS_IMETHODIMP nsCheckboxControlFrame::RestoreState(nsIPresContext* aPresContext,
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nsIPresState* aState)
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{
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nsAutoString string;
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aState->GetStateProperty("checked", string);
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SetCheckboxControlFrameState(aPresContext, string);
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return NS_OK;
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}
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