view/public/nsIViewManager.h

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  37
  38 #ifndef nsIViewManager_h___
  39 #define nsIViewManager_h___
  40
  41 #include "nscore.h"
  42 #include "nsIView.h"
  43 #include "nsColor.h"
  44 #include "nsEvent.h"
  45 #include "nsIRenderingContext.h"
  46
  47 class nsIScrollableView;
  48 class nsIWidget;
  49 struct nsRect;
  50 class nsRegion;
  51 class nsIDeviceContext;
  52 class nsIViewObserver;
  53
  54 enum nsRectVisibility {
  55   nsRectVisibility_kVisible,
  56   nsRectVisibility_kAboveViewport,
  57   nsRectVisibility_kBelowViewport,
  58   nsRectVisibility_kLeftOfViewport,
  59   nsRectVisibility_kRightOfViewport,
  60   nsRectVisibility_kZeroAreaRect
  61 };
  62
  63 // 855e75b8-32cf-4e16-bc50-4e04c53f6cbc
  64 #define NS_IVIEWMANAGER_IID   \
  65 { 0x855e75b8, 0x32cf, 0x4e16, \
  66   { 0xbc, 0x50, 0x4e, 0x04, 0xc5, 0x3f, 0x6c, 0xbc } }
  67
  68 class nsIViewManager : public nsISupports
  69 {
  70 public:
  71
  72   NS_DECLARE_STATIC_IID_ACCESSOR(NS_IVIEWMANAGER_IID)
  73   /**
  74    * Initialize the ViewManager
  75    * Note: this instance does not hold a reference to the viewobserver
  76    * because it holds a reference to this instance.
  77    * @result The result of the initialization, NS_OK if no errors
  78    */
  79   NS_IMETHOD  Init(nsIDeviceContext* aContext) = 0;
  80
  81   /**
  82    * Create an ordinary view
  83    * @param aBounds initial bounds for view
  84    *        XXX We should eliminate this parameter; you can set the bounds after CreateView
  85    * @param aParent intended parent for view. this is not actually set in the
  86    *        nsIView through this method. it is only used by the initialization
  87    *        code to walk up the view tree, if necessary, to find resources.
  88    *        XXX We should eliminate this parameter!
  89    * @param aVisibilityFlag initial visibility state of view
  90    *        XXX We should eliminate this parameter; you can set it after CreateView
  91    * @result The new view
  92    */
  93   NS_IMETHOD_(nsIView*) CreateView(const nsRect& aBounds,
  94                                    const nsIView* aParent,
  95                                    nsViewVisibility aVisibilityFlag = nsViewVisibility_kShow) = 0;
  96
  97   /**
  98    * Create an scrollable view
  99    * @param aBounds initial bounds for view
 100    *        XXX We should eliminate this parameter; you can set the bounds after CreateScrollableView
 101    * @param aParent intended parent for view. this is not actually set in the
 102    *        nsIView through this method. it is only used by the initialization
 103    *        code to walk up the view tree, if necessary, to find resources.
 104    *        XXX We should eliminate this parameter!
 105    * @result The new view
 106    */
 107   NS_IMETHOD_(nsIScrollableView*) CreateScrollableView(const nsRect& aBounds,
 108                                                        const nsIView* aParent) = 0;
 109
 110   /**
 111    * Get the root of the view tree.
 112    * @result the root view
 113    */
 114   NS_IMETHOD  GetRootView(nsIView *&aView) = 0;
 115
 116   /**
 117    * Set the root of the view tree. Does not destroy the current root view.
 118    * aView may have a parent view managed by a different view manager.
 119    * aView may have a widget (anything but printing) or may not (printing).
 120    * @param aView view to set as root
 121    */
 122   NS_IMETHOD  SetRootView(nsIView *aView) = 0;
 123
 124   /**
 125    * Get the dimensions of the root window. The dimensions are in
 126    * twips
 127    * @param aWidth out parameter for width of window in twips
 128    * @param aHeight out parameter for height of window in twips
 129    */
 130   NS_IMETHOD  GetWindowDimensions(nscoord *aWidth, nscoord *aHeight) = 0;
 131
 132   /**
 133    * Set the dimensions of the root window.
 134    * Called if the root window is resized. The dimensions are in
 135    * twips
 136    * @param aWidth of window in twips
 137    * @param aHeight of window in twips
 138    */
 139   NS_IMETHOD  SetWindowDimensions(nscoord aWidth, nscoord aHeight) = 0;
 140
 141   /**
 142    * Called to force a redrawing of any dirty areas.
 143    */
 144   // XXXbz why is this exposed?  Shouldn't update view batches handle this?
 145   // It's not like Composite() does what's expected inside a view update batch
 146   // anyway, since dirty areas may not have been invalidated on the widget yet
 147   // and widget changes may not have been propagated yet.  Maybe this should
 148   // call FlushPendingInvalidates()?
 149   NS_IMETHOD  Composite(void) = 0;
 150
 151   /**
 152    * Called to inform the view manager that the entire area of a view
 153    * is dirty and needs to be redrawn.
 154    * @param aView view to paint. should be root view
 155    * @param aUpdateFlags see bottom of nsIViewManager.h for description
 156    */
 157   NS_IMETHOD  UpdateView(nsIView *aView, PRUint32 aUpdateFlags) = 0;
 158
 159   /**
 160    * Called to inform the view manager that some portion of a view
 161    * is dirty and needs to be redrawn. The rect passed in
 162    * should be in the view's coordinate space.
 163    * @param aView view to paint. should be root view
 164    * @param rect rect to mark as damaged
 165    * @param aUpdateFlags see bottom of nsIViewManager.h for description
 166    */
 167   NS_IMETHOD  UpdateView(nsIView *aView, const nsRect &aRect, PRUint32 aUpdateFlags) = 0;
 168
 169   /**
 170    * Called to inform the view manager that it should redraw all views.
 171    * @param aView view to paint. should be root view
 172    * @param aUpdateFlags see bottom of nsIViewManager.h for description
 173    */
 174   NS_IMETHOD  UpdateAllViews(PRUint32 aUpdateFlags) = 0;
 175
 176   /**
 177    * Called to dispatch an event to the appropriate view. Often called
 178    * as a result of receiving a mouse or keyboard event from the widget
 179    * event system.
 180    * @param event event to dispatch
 181    * @result event handling status
 182    */
 183   NS_IMETHOD  DispatchEvent(nsGUIEvent *aEvent, nsEventStatus* aStatus) = 0;
 184
 185   /**
 186    * Used to grab/capture all mouse events for a specific view,
 187    * irrespective of the cursor position at which the
 188    * event occurred.
 189    * @param aView view to capture mouse events
 190    * @result event handling status
 191    */
 192   NS_IMETHOD  GrabMouseEvents(nsIView *aView, PRBool& aResult) = 0;
 193
 194   /**
 195    * Get the current view, if any, that's capturing mouse events.
 196    * @result view that is capturing mouse events or nsnull
 197    */
 198   NS_IMETHOD  GetMouseEventGrabber(nsIView *&aView) = 0;
 199
 200   /**
 201    * Given a parent view, insert another view as its child.
 202    * aSibling and aAbove control the "document order" for the insertion.
 203    * If aSibling is null, the view is inserted at the end of the document order
 204    * if aAfter is PR_TRUE, otherwise it is inserted at the beginning.
 205    * If aSibling is non-null, then if aAfter is PR_TRUE, the view is inserted
 206    * after the sibling in document order (appearing above the sibling unless
 207    * overriden by z-order).
 208    * If it is PR_FALSE, the view is inserted before the sibling.
 209    * The view manager generates the appopriate dirty regions.
 210    * @param aParent parent view
 211    * @param aChild child view
 212    * @param aSibling sibling view
 213    * @param aAfter after or before in the document order
 214    */
 215   NS_IMETHOD  InsertChild(nsIView *aParent, nsIView *aChild, nsIView *aSibling,
 216                           PRBool aAfter) = 0;
 217
 218   /**
 219    * Remove a specific child view from its parent. This will NOT remove its placeholder
 220    * if there is one.
 221    * The view manager generates the appropriate dirty regions.
 222    * @param aParent parent view
 223    * @param aChild child view
 224    */
 225   NS_IMETHOD  RemoveChild(nsIView *aChild) = 0;
 226
 227   /**
 228    * Move a view to the specified position, provided in parent coordinates.
 229    * The new position is the (0, 0) origin for the view's coordinate system.
 230    * The view's bounds may extend above or to the left of this point.
 231    * The view manager generates the appropriate dirty regions.
 232    * @param aView view to move
 233    * @param aX x value for new view position
 234    * @param aY y value for new view position
 235    */
 236   NS_IMETHOD  MoveViewTo(nsIView *aView, nscoord aX, nscoord aY) = 0;
 237
 238   /**
 239    * Resize a view. In addition to setting the width and height, you can
 240    * set the x and y of its bounds relative to its position. Negative x and y
 241    * will let the view extend above and to the left of the (0,0) point in its
 242    * coordinate system.
 243    * The view manager generates the appropriate dirty regions.
 244    * @param aView view to move
 245    * @param the new bounds relative to the current position
 246    * @param RepaintExposedAreaOnly
 247    *     if PR_TRUE Repaint only the expanded or contracted region,
 248    *     if PR_FALSE Repaint the union of the old and new rectangles.
 249    */
 250   NS_IMETHOD  ResizeView(nsIView *aView, const nsRect &aRect,
 251                          PRBool aRepaintExposedAreaOnly = PR_FALSE) = 0;
 252
 253   /**
 254    * Set the visibility of a view.
 255    * The view manager generates the appropriate dirty regions.
 256    * @param aView view to change visibility state of
 257    * @param visible new visibility state
 258    */
 259   NS_IMETHOD  SetViewVisibility(nsIView *aView, nsViewVisibility aVisible) = 0;
 260
 261   /**
 262    * Set the z-index of a view. Positive z-indices mean that a view
 263    * is above its parent in z-order. Negative z-indices mean that a
 264    * view is below its parent.
 265    * The view manager generates the appropriate dirty regions.
 266    * @param aAutoZIndex indicate that the z-index of a view is "auto". An "auto" z-index
 267    * means that the view does not define a new stacking context,
 268    * which means that the z-indicies of the view's children are
 269    * relative to the view's siblings.
 270    * @param aView view to change z depth of
 271    * @param aZindex explicit z depth
 272    * @param aTopMost used when this view is z-index:auto to compare against
 273    *        other z-index:auto views.
 274    *        PR_TRUE if the view should be topmost when compared with
 275    *        other z-index:auto views.
 276    */
 277   NS_IMETHOD  SetViewZIndex(nsIView *aView, PRBool aAutoZIndex, PRInt32 aZindex, PRBool aTopMost = PR_FALSE) = 0;
 278
 279   /**
 280    * Set whether the view "floats" above all other views,
 281    * which tells the compositor not to consider higher views in
 282    * the view hierarchy that would geometrically intersect with
 283    * this view. This is a hack, but it fixes some problems with
 284    * views that need to be drawn in front of all other views.
 285    */
 286   NS_IMETHOD  SetViewFloating(nsIView *aView, PRBool aFloatingView) = 0;
 287
 288   /**
 289    * Set the view observer associated with this manager
 290    * @param aObserver - new observer
 291    * @result error status
 292    */
 293   NS_IMETHOD SetViewObserver(nsIViewObserver *aObserver) = 0;
 294
 295   /**
 296    * Get the view observer associated with this manager
 297    * @param aObserver - out parameter for observer
 298    * @result error status
 299    */
 300   NS_IMETHOD GetViewObserver(nsIViewObserver *&aObserver) = 0;
 301
 302   /**
 303    * Get the device context associated with this manager
 304    * @result device context
 305    */
 306   NS_IMETHOD  GetDeviceContext(nsIDeviceContext *&aContext) = 0;
 307
 308   /**
 309    * prevent the view manager from refreshing.
 310    * @return error status
 311    */
 312   // XXXbz callers of this function don't seem to realize that it disables
 313   // refresh for the entire view manager hierarchy.... Maybe it shouldn't do
 314   // that?
 315   NS_IMETHOD DisableRefresh(void) = 0;
 316
 317   /**
 318    * allow the view manager to refresh. this may cause a synchronous
 319    * paint to occur inside the call.
 320    * @param aUpdateFlags see bottom of nsIViewManager.h for description
 321    * @return error status
 322    */
 323   NS_IMETHOD EnableRefresh(PRUint32 aUpdateFlags) = 0;
 324
 325   class NS_STACK_CLASS UpdateViewBatch {
 326   public:
 327     UpdateViewBatch() {}
 328   /**
 329    * prevents the view manager from refreshing. allows UpdateView()
 330    * to notify widgets of damaged regions that should be repainted
 331    * when the batch is ended. Call EndUpdateViewBatch on this object
 332    * before it is destroyed
 333    * @return error status
 334    */
 335     UpdateViewBatch(nsIViewManager* aVM) {
 336       if (aVM) {
 337         mRootVM = aVM->BeginUpdateViewBatch();
 338       }
 339     }
 340     ~UpdateViewBatch() {
 341       NS_ASSERTION(!mRootVM, "Someone forgot to call EndUpdateViewBatch!");
 342     }
 343
 344     /**
 345      * See the constructor, this lets you "fill in" a blank UpdateViewBatch.
 346      */
 347     void BeginUpdateViewBatch(nsIViewManager* aVM) {
 348       NS_ASSERTION(!mRootVM, "already started a batch!");
 349       if (aVM) {
 350         mRootVM = aVM->BeginUpdateViewBatch();
 351       }
 352     }
 353
 354   /**
 355    * allow the view manager to refresh any damaged areas accumulated
 356    * after the BeginUpdateViewBatch() call.  this may cause a
 357    * synchronous paint to occur inside the call if aUpdateFlags
 358    * NS_VMREFRESH_IMMEDIATE is set.
 359    *
 360    * If this is not the outermost view batch command, then this does
 361    * nothing except that the specified flags are remembered. When the
 362    * outermost batch finally ends, we merge together all the flags for the
 363    * inner batches in the following way:
 364    * -- If any batch specified NS_VMREFRESH_IMMEDIATE, then we use that flag
 365    * (i.e. there is a synchronous paint under the last EndUpdateViewBatch)
 366    * -- Otherwise if any batch specified NS_VMREFERSH_DEFERRED, then we use
 367    * that flag (i.e. invalidation is deferred until the processing of an
 368    * Invalidate PLEvent)
 369    * -- Otherwise all batches specified NS_VMREFRESH_NO_SYNC and we honor
 370    * that; all widgets are invalidated normally and will be painted the next
 371    * time the toolkit chooses to update them.
 372    *
 373    * @param aUpdateFlags see bottom of nsIViewManager.h for
 374    * description @return error status
 375    */
 376     void EndUpdateViewBatch(PRUint32 aUpdateFlags) {
 377       if (!mRootVM)
 378         return;
 379       mRootVM->EndUpdateViewBatch(aUpdateFlags);
 380       mRootVM = nsnull;
 381     }
 382
 383   private:
 384     UpdateViewBatch(const UpdateViewBatch& aOther);
 385     const UpdateViewBatch& operator=(const UpdateViewBatch& aOther);
 386
 387     nsCOMPtr<nsIViewManager> mRootVM;
 388   };
 389
 390 private:
 391   friend class UpdateViewBatch;
 392
 393   virtual nsIViewManager* BeginUpdateViewBatch(void) = 0;
 394   NS_IMETHOD EndUpdateViewBatch(PRUint32 aUpdateFlags) = 0;
 395
 396 public:
 397
 398   /**
 399    * set the view that is is considered to be the root scrollable
 400    * view for the document.
 401    * @param aScrollable root scrollable view
 402    * @return error status
 403    */
 404   NS_IMETHOD SetRootScrollableView(nsIScrollableView *aScrollable) = 0;
 405
 406   /**
 407    * get the view that is is considered to be the root scrollable
 408    * view for the document.
 409    * @param aScrollable out parameter for root scrollable view
 410    * @return error status
 411    */
 412   NS_IMETHOD GetRootScrollableView(nsIScrollableView **aScrollable) = 0;
 413
 414   /**
 415    * Retrieve the widget at the root of the view manager. This is the
 416    * widget associated with the root view, if the root view exists and has
 417    * a widget.
 418    */
 419   NS_IMETHOD GetWidget(nsIWidget **aWidget) = 0;
 420
 421   /**
 422    * Force update of view manager widget
 423    * Callers should use UpdateView(view, NS_VMREFRESH_IMMEDIATE) in most cases instead
 424    * @result error status
 425    */
 426   // XXXbz Callers seem to be confused about this one... and it doesn't play
 427   // right with view update batching at all (will miss updates).  Maybe this
 428   // should call FlushPendingInvalidates()?
 429   NS_IMETHOD ForceUpdate() = 0;
 430
 431   /**
 432    * Indicate whether the viewmanager is currently painting
 433    *
 434    * @param aPainting PR_TRUE if the viewmanager is painting
 435    *                  PR_FALSE otherwise
 436    */
 437   NS_IMETHOD IsPainting(PRBool& aIsPainting)=0;
 438
 439   /**
 440    * Set the default background color that the view manager should use
 441    * to paint otherwise unowned areas. If the color isn't known, just set
 442    * it to zero (which means 'transparent' since the color is RGBA).
 443    *
 444    * @param aColor the default background color
 445    */
 446   NS_IMETHOD SetDefaultBackgroundColor(nscolor aColor)=0;
 447
 448   /**
 449    * Retrieve the default background color.
 450    *
 451    * @param aColor the default background color
 452    */
 453   NS_IMETHOD GetDefaultBackgroundColor(nscolor* aColor)=0;
 454
 455   /**
 456    * Retrieve the time of the last user event. User events
 457    * include mouse and keyboard events. The viewmanager
 458    * saves the time of the last user event.
 459    *
 460    * @param aTime Last user event time in microseconds
 461    */
 462   NS_IMETHOD GetLastUserEventTime(PRUint32& aTime)=0;
 463
 464   /**
 465    * Determine if a rectangle specified in the view's coordinate system
 466    * is completely, or partially visible.
 467    * @param aView view that aRect coordinates are specified relative to
 468    * @param aRect rectangle in twips to test for visibility
 469    * @param aMinTwips is the min. pixel rows or cols at edge of screen
 470    *                  needed for object to be counted visible
 471    * @param aRectVisibility returns eVisible if the rect is visible,
 472    *                        otherwise it returns an enum indicating why not
 473    */
 474   NS_IMETHOD GetRectVisibility(nsIView *aView, const nsRect &aRect,
 475                                PRUint16 aMinTwips,
 476                                nsRectVisibility *aRectVisibility)=0;
 477
 478   /**
 479    * Dispatch a mouse move event based on the most recent mouse
 480    * position.  This is used when the contents of the page moved
 481    * (aFromScroll is false) or scrolled (aFromScroll is true).
 482    */
 483   NS_IMETHOD SynthesizeMouseMove(PRBool aFromScroll)=0;
 484
 485 };
 486
 487 NS_DEFINE_STATIC_IID_ACCESSOR(nsIViewManager, NS_IVIEWMANAGER_IID)
 488
 489 // Paint timing mode flags
 490
 491 // intermediate: do no special timing processing; repaint when the
 492 // toolkit issues an expose event (which will happen *before* PLEvent
 493 // processing). This is essentially the default.
 494 #define NS_VMREFRESH_NO_SYNC            0
 495
 496 // least immediate: we suppress invalidation, storing dirty areas in
 497 // views, and post an Invalidate PLEvent. The Invalidate event gets
 498 // processed after toolkit events such as window resize events!
 499 // This is only usable with EndUpdateViewBatch and EnableRefresh.
 500 #define NS_VMREFRESH_DEFERRED           0x0001
 501
 502 // most immediate: force a call to nsViewManager::Composite, which
 503 // synchronously updates the window(s) right away before returning
 504 #define NS_VMREFRESH_IMMEDIATE          0x0002
 505
 506 //animate scroll operation
 507 #define NS_VMREFRESH_SMOOTHSCROLL       0x0008
 508
 509 #endif  // nsIViewManager_h___