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add ability to have a sub-frame (such as an inner box) be the area which is where the draggable content resides.

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This commit is contained in:
pinkerton%netscape.com 1999-11-02 03:54:24 +00:00
parent ae1c574569
commit 444df86409
2 changed files with 85 additions and 11 deletions
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92
layout/xul/base/src/nsToolbarDragListener.cpp
View File

@ -29,6 +29,9 @@
#include "nsIEventStateManager.h"
#include "nsISupportsPrimitives.h"
#include "nsINameSpaceManager.h"
#include "nsIDOMXULDocument.h"
#include "nsIDocument.h"
#include "nsIPresShell.h"
NS_IMPL_ADDREF(nsToolbarDragListener)
@ -38,14 +41,18 @@ NS_IMPL_RELEASE(nsToolbarDragListener)
//
// nsToolbarDragListener ctor
//
// Not much to do besides init member variables
// Init member variables. We can't really do much of anything important here because
// any subframes might not be totally intialized yet, or in the hash table
//
nsToolbarDragListener :: nsToolbarDragListener ( nsToolbarFrame* inToolbar, nsIPresContext* inPresContext )
: mToolbar(inToolbar), mPresContext(inPresContext), mCurrentDropLoc(-1)
{
NS_INIT_REFCNT();
}
// we really need this all over the place. just be safe that we have it.
NS_ASSERTION ( mPresContext, "no pres context set on toolbar drag listener" );
} // nsToolbarDragListener ctor
//
@ -131,17 +138,23 @@ nsToolbarDragListener :: ItemMouseIsOver ( nsIDOMEvent* aDragEvent, nscoord* out
{
*outOnChild = PR_FALSE;
// figure out which frame is the right one for determining the drop feedback. Do we
// want to do this every time? We certainly can't do it upon toolbar creation (hash
// tables not setup at that time), so we're forced to do it now. What happens if while
// we're dragging some rule gets fired that causes the frame to go away?
nsIFrame* dropAreaFrame = LocateDropAreaFrame();
if ( !dropAreaFrame ) {
// gaaak, we're doomed.
outIndex = 0;
outXLoc = 0;
return;
}
nsCOMPtr<nsIDOMUIEvent> uiEvent(do_QueryInterface(aDragEvent));
PRInt32 x,y = 0;
uiEvent->GetClientX(&x);
uiEvent->GetClientY(&y);
// This is kind of hooky but its the easiest thing to do
// The mPresContext is set into this class from the nsToolbarFrame
// It's needed here for figuring out twips &
// resetting the active state in the event manager after the drop takes place.
NS_ASSERTION ( mPresContext, "no pres context set on listener" );
// translate the mouse coords into twips
float p2t;
mPresContext->GetScaledPixelsToTwips(&p2t);
@ -152,7 +165,7 @@ nsToolbarDragListener :: ItemMouseIsOver ( nsIDOMEvent* aDragEvent, nscoord* out
// get the toolbar's rect
nsRect tbRect;
mToolbar->GetRect(tbRect);
dropAreaFrame->GetRect(tbRect);
PRUint32 count = 0;
PRBool found = PR_FALSE;
@ -161,7 +174,7 @@ nsToolbarDragListener :: ItemMouseIsOver ( nsIDOMEvent* aDragEvent, nscoord* out
nsRect prevRect(-1, -1, 0, 0);
// Now loop through the child and see if the mouse is over a child
mToolbar->FirstChild(nsnull, &childFrame);
dropAreaFrame->FirstChild(nsnull, &childFrame);
while ( childFrame ) {
// The mouse coords are in the toolbar's domain
@ -361,3 +374,60 @@ nsToolbarDragListener::DragDrop(nsIDOMEvent* aMouseEvent)
return NS_OK;
}
//
// LocateDropAreaFrame
//
// Returns the frame (or subframe) that contains the buttons that can be dragged.
// Either it will be the toolbar frame as a whole, or it will be some subframe of the bar id'd by
// the |dragdroparea| attribute.
//
nsIFrame*
nsToolbarDragListener :: LocateDropAreaFrame ( )
{
nsIFrame* retVal = nsnull;
// is a subframe the drag/drop area? determine if the attribute is set.
nsString dropAreaID;
PRBool dropAreaIsSubframe = PR_FALSE;
nsCOMPtr<nsIContent> toolbarContent;
mToolbar->GetContent ( getter_AddRefs(toolbarContent) );
if ( toolbarContent ) {
if ( toolbarContent->GetAttribute(kNameSpaceID_None, nsXULAtoms::tbDragDropArea, dropAreaID) == NS_CONTENT_ATTR_HAS_VALUE )
dropAreaIsSubframe = PR_TRUE;
}
// if there is a named subframe, go find it, otherwise use the entire toolbar
if ( dropAreaIsSubframe ) {
// get the presShell so we can call GetPrimaryFrameFor later.
nsCOMPtr<nsIPresShell> presShell;
mPresContext->GetShell ( getter_AddRefs(presShell) );
// get the document so we can get do a GetElementByID.
nsCOMPtr<nsIDocument> document;
toolbarContent->GetDocument ( *getter_AddRefs(document) );
if ( document ) {
nsCOMPtr<nsIDOMXULDocument> xulDoc ( do_QueryInterface(document) );
if ( xulDoc ) {
nsCOMPtr<nsIDOMElement> domElementOfSubframe;
xulDoc->GetElementById ( dropAreaID, getter_AddRefs(domElementOfSubframe) );
// finally get the frame associated with that dom node
nsCOMPtr<nsIContent> contentOfSubframe ( do_QueryInterface(domElementOfSubframe) );
if ( contentOfSubframe && presShell )
presShell->GetPrimaryFrameFor ( contentOfSubframe, &retVal );
}
}
} // if named subframe
else
retVal = mToolbar;
NS_ASSERTION ( retVal, "toolbar drag listener couldn't figure out the drag area." );
return retVal;
} // LocateDropAreaFrame

4
layout/xul/base/src/nsToolbarDragListener.h
View File

@ -27,6 +27,7 @@
class nsToolbarFrame;
class nsIPresContext;
class nsIDOMEvent;
class nsIFrame;
class nsToolbarDragListener : public nsIDOMDragListener
@ -56,6 +57,9 @@ protected:
// is a container and the drop would be "on" that item.
void ItemMouseIsOver(nsIDOMEvent* aDragEvent, nscoord* outXLoc, PRUint32* outIndex, PRBool* outOnChild);
// Find the frame (or subframe) that contains the buttons that can be dragged.
nsIFrame* LocateDropAreaFrame ( ) ;
nsToolbarFrame * mToolbar; // toolbar owns me, don't be circular
nsIPresContext * mPresContext; // weak reference
PRInt32 mCurrentDropLoc;