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nsIScrollPositionListener support.

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This commit is contained in:
beard%netscape.com 1999-09-18 04:42:11 +00:00
parent 4fca2fc2b8
commit 4ba19f3a53
3 changed files with 124 additions and 85 deletions
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21
view/public/nsIScrollableView.h
View File

@ -22,10 +22,11 @@
#include "nsISupports.h"
#include "nsCoord.h"
#include "nsIViewManager.h"
class nsIView;
typedef enum
{
class nsIView;
class nsIScrollPositionListener;
typedef enum {
nsScrollPreference_kAuto = 0,
nsScrollPreference_kNeverScroll,
nsScrollPreference_kAlwaysScroll
@ -45,10 +46,8 @@ typedef enum
* because the scrolled view is made a child of the clip view (an internal
* child view created by the scrolling view).
*
* XXX Rename this class nsIScrollingView
*/
class nsIScrollableView : public nsISupports
{
class nsIScrollableView : public nsISupports {
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_ISCROLLABLEVIEW_IID)
@ -209,6 +208,16 @@ public:
* Returns the clip view
*/
NS_IMETHOD GetClipView(const nsIView** aClipView) const = 0;
/**
* Adds a scroll position listener.
*/
NS_IMETHOD AddScrollPositionListener(nsIScrollPositionListener* aListener) = 0;
/**
* Removes a scroll position listener.
*/
NS_IMETHOD RemoveScrollPositionListener(nsIScrollPositionListener* aListener) = 0;
};
//regardless of the transparency or opacity settings

172
view/src/nsScrollingView.cpp
View File

@ -30,6 +30,8 @@
#include "nsIFrame.h"
#include "nsILookAndFeel.h"
#include "nsIClipView.h"
#include "nsISupportsArray.h"
#include "nsIScrollPositionListener.h"
static NS_DEFINE_IID(kWidgetCID, NS_CHILD_CID);
static NS_DEFINE_IID(kLookAndFeelCID, NS_LOOKANDFEEL_CID);
@ -356,6 +358,7 @@ nsScrollingView::nsScrollingView()
mScrollPref = nsScrollPreference_kAuto;
mScrollingTimer = nsnull;
mLineHeight = 240;
mListeners = nsnull;
}
nsScrollingView::~nsScrollingView()
@ -380,6 +383,11 @@ nsScrollingView::~nsScrollingView()
mScrollingTimer->Cancel();
NS_RELEASE(mScrollingTimer);
}
if (nsnull != mListeners) {
mListeners->Clear();
NS_RELEASE(mListeners);
}
}
nsresult nsScrollingView::QueryInterface(const nsIID& aIID, void** aInstancePtr)
@ -607,6 +615,24 @@ NS_IMETHODIMP nsScrollingView::GetClipView(const nsIView** aClipView) const
return NS_OK;
}
NS_IMETHODIMP nsScrollingView::AddScrollPositionListener(nsIScrollPositionListener* aListener)
{
if (nsnull == mListeners) {
nsresult rv = NS_NewISupportsArray(&mListeners);
if (NS_FAILED(rv))
return rv;
}
return mListeners->AppendElement(aListener);
}
NS_IMETHODIMP nsScrollingView::RemoveScrollPositionListener(nsIScrollPositionListener* aListener)
{
if (nsnull != mListeners) {
return mListeners->RemoveElement(aListener);
}
return NS_ERROR_FAILURE;
}
void nsScrollingView::HandleScrollEvent(nsGUIEvent *aEvent, PRUint32 aEventFlags)
{
nsIView *scview = nsView::GetViewFor(aEvent->widget);
@ -1182,110 +1208,108 @@ NS_IMETHODIMP nsScrollingView::GetScrollPreference(nsScrollPreference &aScrollPr
NS_IMETHODIMP nsScrollingView::ScrollTo(nscoord aX, nscoord aY, PRUint32 aUpdateFlags)
{
nsIDeviceContext *dev;
float t2p;
float p2t;
nsSize clipSize;
nsIWidget *widget;
PRInt32 dx = 0, dy = 0;
nsIView *scrolledView;
nsIDeviceContext *dev;
float t2p;
float p2t;
nsSize clipSize;
nsIWidget *widget;
PRInt32 dx = 0, dy = 0;
nsIView *scrolledView;
mViewManager->GetDeviceContext(dev);
dev->GetAppUnitsToDevUnits(t2p);
dev->GetDevUnitsToAppUnits(p2t);
mViewManager->GetDeviceContext(dev);
dev->GetAppUnitsToDevUnits(t2p);
dev->GetDevUnitsToAppUnits(p2t);
NS_RELEASE(dev);
NS_RELEASE(dev);
mClipView->GetDimensions(&clipSize.width, &clipSize.height);
mClipView->GetDimensions(&clipSize.width, &clipSize.height);
mVScrollBarView->GetWidget(widget);
mVScrollBarView->GetWidget(widget);
if (nsnull != widget) {
nsIScrollbar* scrollv = nsnull;
if (NS_OK == widget->QueryInterface(NS_GET_IID(nsIScrollbar), (void **)&scrollv)) {
// Clamp aY
if (nsnull != widget) {
nsIScrollbar* scrollv = nsnull;
if (NS_OK == widget->QueryInterface(NS_GET_IID(nsIScrollbar), (void **)&scrollv)) {
// Clamp aY
if ((aY + clipSize.height) > mSizeY)
aY = mSizeY - clipSize.height;
if ((aY + clipSize.height) > mSizeY)
aY = mSizeY - clipSize.height;
if (aY < 0)
aY = 0;
if (aY < 0)
aY = 0;
// Move the scrollbar's thumb
// Move the scrollbar's thumb
PRUint32 oldpos = mOffsetY;
PRUint32 newpos = NSIntPixelsToTwips(NSTwipsToIntPixels(aY, t2p), p2t);
PRUint32 oldpos = mOffsetY;
PRUint32 newpos = NSIntPixelsToTwips(NSTwipsToIntPixels(aY, t2p), p2t);
scrollv->SetPosition(newpos);
scrollv->SetPosition(newpos);
dy = NSTwipsToIntPixels((oldpos - newpos), t2p);
dy = NSTwipsToIntPixels((oldpos - newpos), t2p);
NS_RELEASE(scrollv);
}
NS_RELEASE(scrollv);
}
NS_RELEASE(widget);
}
NS_RELEASE(widget);
}
mHScrollBarView->GetWidget(widget);
mHScrollBarView->GetWidget(widget);
if (nsnull != widget) {
nsIScrollbar* scrollh = nsnull;
if (NS_OK == widget->QueryInterface(NS_GET_IID(nsIScrollbar), (void **)&scrollh)) {
// Clamp aX
if (nsnull != widget) {
nsIScrollbar* scrollh = nsnull;
if (NS_OK == widget->QueryInterface(NS_GET_IID(nsIScrollbar), (void **)&scrollh)) {
// Clamp aX
if ((aX + clipSize.width) > mSizeX)
aX = mSizeX - clipSize.width;
if ((aX + clipSize.width) > mSizeX)
aX = mSizeX - clipSize.width;
if (aX < 0)
aX = 0;
if (aX < 0)
aX = 0;
// Move the scrollbar's thumb
// Move the scrollbar's thumb
PRUint32 oldpos = mOffsetX;
PRUint32 newpos = NSIntPixelsToTwips(NSTwipsToIntPixels(aX, t2p), p2t);
PRUint32 oldpos = mOffsetX;
PRUint32 newpos = NSIntPixelsToTwips(NSTwipsToIntPixels(aX, t2p), p2t);
scrollh->SetPosition(newpos);
scrollh->SetPosition(newpos);
dx = NSTwipsToIntPixels((oldpos - newpos), t2p);
dx = NSTwipsToIntPixels((oldpos - newpos), t2p);
NS_RELEASE(scrollh);
}
NS_RELEASE(scrollh);
}
NS_RELEASE(widget);
}
NS_RELEASE(widget);
}
// Update the scrolled view's position
// Update the scrolled view's position
GetScrolledView(scrolledView);
GetScrolledView(scrolledView);
if (nsnull != scrolledView)
{
scrolledView->SetPosition(-aX, -aY);
if (nsnull != scrolledView)
{
scrolledView->SetPosition(-aX, -aY);
mOffsetX = aX;
mOffsetY = aY;
}
mOffsetX = aX;
mOffsetY = aY;
}
Scroll(scrolledView, dx, dy, t2p, 0);
Scroll(scrolledView, dx, dy, t2p, 0);
#if 0
if (dx || dy)
AdjustChildWidgets(this, scrolledView, 0, 0, t2p);
// notify the listeners.
if (nsnull != mListeners) {
PRUint32 listenerCount;
if (NS_SUCCEEDED(mListeners->Count(&listenerCount))) {
const nsIID& kScrollPositionListenerIID = NS_GET_IID(nsIScrollPositionListener);
nsIScrollPositionListener* listener;
for (PRUint32 i = 0; i < listenerCount; i++) {
if (NS_SUCCEEDED(mListeners->QueryElementAt(i, kScrollPositionListenerIID, (void**)&listener))) {
listener->ScrollPositionChanged(this, aX, aY);
NS_RELEASE(listener);
}
}
}
}
// Damage the updated area
nsRect r;
r.x = 0;
r.y = aY;
mClipView->GetDimensions(&r.width, &r.height);
if (nsnull != scrolledView)
mViewManager->UpdateView(scrolledView, r, aUpdateFlags);
}
#endif
return NS_OK;
return NS_OK;
}
NS_IMETHODIMP nsScrollingView::SetControlInsets(const nsMargin &aInsets)

16
view/src/nsScrollingView.h
View File

@ -24,6 +24,8 @@
#include "nsITimer.h"
#include "nsITimerCallback.h"
class nsISupportsArray;
//this is a class that acts as a container for other views and provides
//automatic management of scrolling of the views it contains.
@ -76,6 +78,9 @@ public:
NS_IMETHOD GetClipView(const nsIView** aClipView) const;
NS_IMETHOD AddScrollPositionListener(nsIScrollPositionListener* aListener);
NS_IMETHOD RemoveScrollPositionListener(nsIScrollPositionListener* aListener);
//locals
void HandleScrollEvent(nsGUIEvent *aEvent, PRUint32 aEventFlags);
@ -113,16 +118,17 @@ protected:
protected:
nscoord mSizeX, mSizeY;
nscoord mOffsetX, mOffsetY;
nsIView *mClipView;
nsIView *mVScrollBarView;
nsIView *mHScrollBarView;
nsIView *mCornerView;
nsIView *mClipView;
nsIView *mVScrollBarView;
nsIView *mHScrollBarView;
nsIView *mCornerView;
nsScrollPreference mScrollPref;
nsMargin mInsets;
nsITimer *mScrollingTimer;
nsITimer *mScrollingTimer;
nscoord mScrollingDelta;
PRUint32 mScrollProperties;
nscoord mLineHeight;
nsISupportsArray *mListeners;
};
#endif