5d72f7deb1
R=reed@google.com Change-Id: Iebfddf752a2ac210a3f5c69de8decd06d0c35617 Reviewed-on: https://skia-review.googlesource.com/7436 Commit-Queue: Herb Derby <herb@google.com> Commit-Queue: Mike Reed <reed@google.com> Reviewed-by: Mike Reed <reed@google.com>
396 lines
14 KiB
C++
396 lines
14 KiB
C++
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/*
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* Copyright 2006 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkView_DEFINED
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#define SkView_DEFINED
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#include "SkEventSink.h"
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#include "SkRect.h"
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#include "SkDOM.h"
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#include "SkMatrix.h"
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#include "SkMetaData.h"
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class SkCanvas;
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class SkLayerView;
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/** \class SkView
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SkView is the base class for screen management. All widgets and controls inherit
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from SkView.
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*/
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class SkView : public SkEventSink {
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public:
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enum Flag_Shift {
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kVisible_Shift,
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kEnabled_Shift,
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kFocusable_Shift,
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kFlexH_Shift,
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kFlexV_Shift,
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kNoClip_Shift,
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kFlagShiftCount
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};
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enum Flag_Mask {
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kVisible_Mask = 1 << kVisible_Shift, //!< set if the view is visible
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kEnabled_Mask = 1 << kEnabled_Shift, //!< set if the view is enabled
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kFocusable_Mask = 1 << kFocusable_Shift, //!< set if the view can receive focus
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kFlexH_Mask = 1 << kFlexH_Shift, //!< set if the view's width is stretchable
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kFlexV_Mask = 1 << kFlexV_Shift, //!< set if the view's height is stretchable
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kNoClip_Mask = 1 << kNoClip_Shift, //!< set if the view is not clipped to its bounds
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kAllFlagMasks = (uint32_t)(0 - 1) >> (32 - kFlagShiftCount)
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};
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SkView(uint32_t flags = 0);
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virtual ~SkView();
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/** Return the flags associated with the view
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*/
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uint32_t getFlags() const { return fFlags; }
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/** Set the flags associated with the view
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*/
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void setFlags(uint32_t flags);
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/** Helper that returns non-zero if the kVisible_Mask bit is set in the view's flags
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*/
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int isVisible() const { return fFlags & kVisible_Mask; }
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int isEnabled() const { return fFlags & kEnabled_Mask; }
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int isFocusable() const { return fFlags & kFocusable_Mask; }
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int isClipToBounds() const { return !(fFlags & kNoClip_Mask); }
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/** Helper to set/clear the view's kVisible_Mask flag */
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void setVisibleP(bool);
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void setEnabledP(bool);
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void setFocusableP(bool);
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void setClipToBounds(bool);
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/** Return the view's width */
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SkScalar width() const { return fWidth; }
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/** Return the view's height */
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SkScalar height() const { return fHeight; }
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/** Set the view's width and height. These must both be >= 0. This does not affect the view's loc */
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void setSize(SkScalar width, SkScalar height);
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void setSize(const SkPoint& size) { this->setSize(size.fX, size.fY); }
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void setWidth(SkScalar width) { this->setSize(width, fHeight); }
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void setHeight(SkScalar height) { this->setSize(fWidth, height); }
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/** Return a rectangle set to [0, 0, width, height] */
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void getLocalBounds(SkRect* bounds) const;
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/** Loc - the view's offset with respect to its parent in its view hiearchy.
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NOTE: For more complex transforms, use Local Matrix. The tranformations
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are applied in the following order:
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canvas->translate(fLoc.fX, fLoc.fY);
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canvas->concat(fMatrix);
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*/
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/** Return the view's left edge */
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SkScalar locX() const { return fLoc.fX; }
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/** Return the view's top edge */
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SkScalar locY() const { return fLoc.fY; }
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/** Set the view's left and top edge. This does not affect the view's size */
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void setLoc(SkScalar x, SkScalar y);
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void setLoc(const SkPoint& loc) { this->setLoc(loc.fX, loc.fY); }
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void setLocX(SkScalar x) { this->setLoc(x, fLoc.fY); }
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void setLocY(SkScalar y) { this->setLoc(fLoc.fX, y); }
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/** Local Matrix - matrix used to tranform the view with respect to its
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parent in its view hiearchy. Use setLocalMatrix to apply matrix
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transformations to the current view and in turn affect its children.
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NOTE: For simple offsets, use Loc. The transformations are applied in
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the following order:
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canvas->translate(fLoc.fX, fLoc.fY);
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canvas->concat(fMatrix);
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*/
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const SkMatrix& getLocalMatrix() const { return fMatrix; }
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void setLocalMatrix(const SkMatrix& matrix);
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/** Offset (move) the view by the specified dx and dy. This does not affect the view's size */
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void offset(SkScalar dx, SkScalar dy);
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/** Call this to have the view draw into the specified canvas. */
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virtual void draw(SkCanvas* canvas);
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/** Call this to invalidate part of all of a view, requesting that the view's
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draw method be called. The rectangle parameter specifies the part of the view
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that should be redrawn. If it is null, it specifies the entire view bounds.
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*/
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void inval(SkRect* rectOrNull);
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// Focus management
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SkView* getFocusView() const;
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bool hasFocus() const;
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enum FocusDirection {
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kNext_FocusDirection,
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kPrev_FocusDirection,
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kFocusDirectionCount
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};
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bool acceptFocus();
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SkView* moveFocus(FocusDirection);
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// Click handling
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class Click {
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public:
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Click(SkView* target);
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virtual ~Click();
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const char* getType() const { return fType; }
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bool isType(const char type[]) const;
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void setType(const char type[]); // does NOT make a copy of the string
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void copyType(const char type[]); // makes a copy of the string
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enum State {
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kDown_State,
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kMoved_State,
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kUp_State
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};
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SkPoint fOrig, fPrev, fCurr;
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SkIPoint fIOrig, fIPrev, fICurr;
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State fState;
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void* fOwner;
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unsigned fModifierKeys;
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SkMetaData fMeta;
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private:
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SkEventSinkID fTargetID;
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char* fType;
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bool fWeOwnTheType;
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void resetType();
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friend class SkView;
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};
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Click* findClickHandler(SkScalar x, SkScalar y, unsigned modifierKeys);
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static void DoClickDown(Click*, int x, int y, unsigned modi);
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static void DoClickMoved(Click*, int x, int y, unsigned modi);
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static void DoClickUp(Click*, int x, int y, unsigned modi);
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/** Send the event to the view's parent, and its parent etc. until one of them
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returns true from its onEvent call. This view is returned. If no parent handles
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the event, null is returned.
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*/
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SkView* sendEventToParents(const SkEvent&);
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/** Send the query to the view's parent, and its parent etc. until one of them
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returns true from its onQuery call. This view is returned. If no parent handles
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the query, null is returned.
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*/
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SkView* sendQueryToParents(SkEvent*);
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// View hierarchy management
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/** Return the view's parent, or null if it has none. This does not affect the parent's reference count. */
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SkView* getParent() const { return fParent; }
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SkView* attachChildToFront(SkView* child);
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/** Attach the child view to this view, and increment the child's reference count. The child view is added
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such that it will be drawn before all other child views.
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The child view parameter is returned.
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*/
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SkView* attachChildToBack(SkView* child);
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/** If the view has a parent, detach the view from its parent and decrement the view's reference count.
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If the parent was the only owner of the view, this will cause the view to be deleted.
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*/
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void detachFromParent();
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/** Attach the child view to this view, and increment the child's reference count. The child view is added
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such that it will be drawn after all other child views.
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The child view parameter is returned.
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*/
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/** Detach all child views from this view. */
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void detachAllChildren();
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/** Convert the specified point from global coordinates into view-local coordinates
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* Return true on success; false on failure
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*/
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bool globalToLocal(SkPoint* pt) const {
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if (pt) {
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return this->globalToLocal(pt->fX, pt->fY, pt);
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}
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return true; // nothing to do so return true
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}
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/** Convert the specified x,y from global coordinates into view-local coordinates, returning
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the answer in the local parameter.
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*/
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bool globalToLocal(SkScalar globalX, SkScalar globalY, SkPoint* local) const;
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/** \class F2BIter
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Iterator that will return each of this view's children, in
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front-to-back order (the order used for clicking). The first
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call to next() returns the front-most child view. When
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next() returns null, there are no more child views.
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*/
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class F2BIter {
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public:
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F2BIter(const SkView* parent);
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SkView* next();
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private:
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SkView* fFirstChild, *fChild;
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};
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/** \class B2FIter
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Iterator that will return each of this view's children, in
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back-to-front order (the order they are drawn). The first
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call to next() returns the back-most child view. When
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next() returns null, there are no more child views.
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*/
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class B2FIter {
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public:
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B2FIter(const SkView* parent);
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SkView* next();
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private:
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SkView* fFirstChild, *fChild;
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};
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/** \class Artist
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Install a subclass of this in a view (calling setArtist()), and then the
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default implementation of that view's onDraw() will invoke this object
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automatically.
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*/
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class Artist : public SkRefCnt {
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public:
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void draw(SkView*, SkCanvas*);
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void inflate(const SkDOM&, const SkDOM::Node*);
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protected:
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virtual void onDraw(SkView*, SkCanvas*) = 0;
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virtual void onInflate(const SkDOM&, const SkDOM::Node*);
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private:
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typedef SkRefCnt INHERITED;
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};
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/** Return the artist attached to this view (or null). The artist's reference
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count is not affected.
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*/
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Artist* getArtist() const;
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/** Attach the specified artist (or null) to the view, replacing any existing
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artist. If the new artist is not null, its reference count is incremented.
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The artist parameter is returned.
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*/
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Artist* setArtist(Artist* artist);
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/** \class Layout
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Install a subclass of this in a view (calling setLayout()), and then the
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default implementation of that view's onLayoutChildren() will invoke
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this object automatically.
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*/
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class Layout : public SkRefCnt {
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public:
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void layoutChildren(SkView* parent);
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void inflate(const SkDOM&, const SkDOM::Node*);
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protected:
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virtual void onLayoutChildren(SkView* parent) = 0;
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virtual void onInflate(const SkDOM&, const SkDOM::Node*);
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private:
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typedef SkRefCnt INHERITED;
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};
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/** Return the layout attached to this view (or null). The layout's reference
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count is not affected.
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*/
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Layout* getLayout() const;
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/** Attach the specified layout (or null) to the view, replacing any existing
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layout. If the new layout is not null, its reference count is incremented.
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The layout parameter is returned.
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*/
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Layout* setLayout(Layout*, bool invokeLayoutNow = true);
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/** If a layout is attached to this view, call its layoutChildren() method
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*/
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void invokeLayout();
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/** Call this to initialize this view based on the specified XML node
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*/
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void inflate(const SkDOM& dom, const SkDOM::Node* node);
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SkDEBUGCODE(void dump(bool recurse) const;)
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protected:
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/** Override this to draw inside the view. Be sure to call the inherited version too */
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virtual void onDraw(SkCanvas*);
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/** Override this to be notified when the view's size changes. Be sure to call the inherited version too */
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virtual void onSizeChange();
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/** Override this if you want to handle an inval request from this view or one of its children.
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Tyically this is only overridden by the by the "window". If your subclass does handle the
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request, return true so the request will not continue to propogate to the parent.
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*/
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virtual bool handleInval(const SkRect*);
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//! called once before all of the children are drawn (or clipped/translated)
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virtual SkCanvas* beforeChildren(SkCanvas* c) { return c; }
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//! called once after all of the children are drawn (or clipped/translated)
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virtual void afterChildren(SkCanvas*) {}
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//! called right before this child's onDraw is called
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virtual void beforeChild(SkView* /*child*/, SkCanvas*) {}
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//! called right after this child's onDraw is called
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virtual void afterChild(SkView* /*child*/, SkCanvas*) {}
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/** Override this if you might handle the click
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*/
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virtual Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi);
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/** Override this to decide if your children are targets for a click.
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The default returns true, in which case your children views will be
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candidates for onFindClickHandler. Returning false wil skip the children
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and just call your onFindClickHandler.
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*/
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virtual bool onSendClickToChildren(SkScalar x, SkScalar y, unsigned modi);
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/** Override this to track clicks, returning true as long as you want to track
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the pen/mouse.
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*/
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virtual bool onClick(Click*);
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/** Override this to initialize your subclass from the XML node. Be sure to call the inherited version too */
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virtual void onInflate(const SkDOM& dom, const SkDOM::Node* node);
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/** Override this if you want to perform post initialization work based on the ID dictionary built
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during XML parsing. Be sure to call the inherited version too.
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*/
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public:
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#ifdef SK_DEBUG
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void validate() const;
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#else
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void validate() const {}
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#endif
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// default action is to inval the view
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virtual void onFocusChange(bool gainFocusP);
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protected:
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// override these if you're acting as a layer/host
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virtual bool onGetFocusView(SkView**) const { return false; }
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virtual bool onSetFocusView(SkView*) { return false; }
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private:
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SkScalar fWidth, fHeight;
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SkMatrix fMatrix;
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SkPoint fLoc;
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SkView* fParent;
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SkView* fFirstChild;
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SkView* fNextSibling;
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SkView* fPrevSibling;
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uint8_t fFlags;
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uint8_t fContainsFocus;
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friend class B2FIter;
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friend class F2BIter;
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friend class SkLayerView;
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bool setFocusView(SkView* fvOrNull);
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SkView* acceptFocus(FocusDirection);
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void detachFromParent_NoLayout();
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/** Compute the matrix to transform view-local coordinates into global ones */
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void localToGlobal(SkMatrix* matrix) const;
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};
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#endif
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