| /* |
| * Copyright (C) 2006 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef SkView_DEFINED |
| #define SkView_DEFINED |
| |
| #include "SkEventSink.h" |
| #include "SkRect.h" |
| #include "SkDOM.h" |
| #include "SkTDict.h" |
| |
| class SkCanvas; |
| class SkLayerView; |
| |
| /** \class SkView |
| |
| SkView is the base class for screen management. All widgets and controls inherit |
| from SkView. |
| */ |
| class SkView : public SkEventSink { |
| public: |
| enum Flag_Shift { |
| kVisible_Shift, |
| kEnabled_Shift, |
| kFocusable_Shift, |
| kFlexH_Shift, |
| kFlexV_Shift, |
| kNoClip_Shift, |
| |
| kFlagShiftCount |
| }; |
| enum Flag_Mask { |
| kVisible_Mask = 1 << kVisible_Shift, //!< set if the view is visible |
| kEnabled_Mask = 1 << kEnabled_Shift, //!< set if the view is enabled |
| kFocusable_Mask = 1 << kFocusable_Shift, //!< set if the view can receive focus |
| kFlexH_Mask = 1 << kFlexH_Shift, //!< set if the view's width is stretchable |
| kFlexV_Mask = 1 << kFlexV_Shift, //!< set if the view's height is stretchable |
| kNoClip_Mask = 1 << kNoClip_Shift, //!< set if the view is not clipped to its bounds |
| |
| kAllFlagMasks = (uint32_t)(0 - 1) >> (32 - kFlagShiftCount) |
| }; |
| |
| SkView(uint32_t flags = 0); |
| virtual ~SkView(); |
| |
| /** Return the flags associated with the view |
| */ |
| uint32_t getFlags() const { return fFlags; } |
| /** Set the flags associated with the view |
| */ |
| void setFlags(uint32_t flags); |
| |
| /** Helper that returns non-zero if the kVisible_Mask bit is set in the view's flags |
| */ |
| int isVisible() const { return fFlags & kVisible_Mask; } |
| int isEnabled() const { return fFlags & kEnabled_Mask; } |
| int isFocusable() const { return fFlags & kFocusable_Mask; } |
| int isClipToBounds() const { return !(fFlags & kNoClip_Mask); } |
| /** Helper to set/clear the view's kVisible_Mask flag */ |
| void setVisibleP(bool); |
| void setEnabledP(bool); |
| void setFocusableP(bool); |
| void setClipToBounds(bool); |
| |
| /** Return the view's width */ |
| SkScalar width() const { return fWidth; } |
| /** Return the view's height */ |
| SkScalar height() const { return fHeight; } |
| /** Set the view's width and height. These must both be >= 0. This does not affect the view's loc */ |
| void setSize(SkScalar width, SkScalar height); |
| void setSize(const SkPoint& size) { this->setSize(size.fX, size.fY); } |
| void setWidth(SkScalar width) { this->setSize(width, fHeight); } |
| void setHeight(SkScalar height) { this->setSize(fWidth, height); } |
| /** Return a rectangle set to [0, 0, width, height] */ |
| void getLocalBounds(SkRect* bounds) const; |
| |
| /** Return the view's left edge */ |
| SkScalar locX() const { return fLoc.fX; } |
| /** Return the view's top edge */ |
| SkScalar locY() const { return fLoc.fY; } |
| /** Set the view's left and top edge. This does not affect the view's size */ |
| void setLoc(SkScalar x, SkScalar y); |
| void setLoc(const SkPoint& loc) { this->setLoc(loc.fX, loc.fY); } |
| void setLocX(SkScalar x) { this->setLoc(x, fLoc.fY); } |
| void setLocY(SkScalar y) { this->setLoc(fLoc.fX, y); } |
| /** Offset (move) the view by the specified dx and dy. This does not affect the view's size */ |
| void offset(SkScalar dx, SkScalar dy); |
| |
| /** Call this to have the view draw into the specified canvas. */ |
| virtual void draw(SkCanvas* canvas); |
| |
| /** Call this to invalidate part of all of a view, requesting that the view's |
| draw method be called. The rectangle parameter specifies the part of the view |
| that should be redrawn. If it is null, it specifies the entire view bounds. |
| */ |
| void inval(SkRect* rectOrNull); |
| |
| // Focus management |
| |
| SkView* getFocusView() const; |
| bool hasFocus() const; |
| |
| enum FocusDirection { |
| kNext_FocusDirection, |
| kPrev_FocusDirection, |
| |
| kFocusDirectionCount |
| }; |
| bool acceptFocus(); |
| SkView* moveFocus(FocusDirection); |
| |
| // Click handling |
| |
| class Click { |
| public: |
| Click(SkView* target); |
| virtual ~Click(); |
| |
| const char* getType() const { return fType; } |
| bool isType(const char type[]) const; |
| void setType(const char type[]); // does NOT make a copy of the string |
| void copyType(const char type[]); // makes a copy of the string |
| |
| enum State { |
| kDown_State, |
| kMoved_State, |
| kUp_State |
| }; |
| SkPoint fOrig, fPrev, fCurr; |
| SkIPoint fIOrig, fIPrev, fICurr; |
| State fState; |
| private: |
| SkEventSinkID fTargetID; |
| char* fType; |
| bool fWeOwnTheType; |
| |
| void resetType(); |
| |
| friend class SkView; |
| }; |
| Click* findClickHandler(SkScalar x, SkScalar y); |
| |
| static void DoClickDown(Click*, int x, int y); |
| static void DoClickMoved(Click*, int x, int y); |
| static void DoClickUp(Click*, int x, int y); |
| |
| /** Send the event to the view's parent, and its parent etc. until one of them |
| returns true from its onEvent call. This view is returned. If no parent handles |
| the event, null is returned. |
| */ |
| SkView* sendEventToParents(const SkEvent&); |
| /** Send the query to the view's parent, and its parent etc. until one of them |
| returns true from its onQuery call. This view is returned. If no parent handles |
| the query, null is returned. |
| */ |
| SkView* sendQueryToParents(SkEvent*); |
| |
| /** Depricated helper function. Just call event->post(sinkID, delay); |
| */ |
| bool postEvent(SkEvent* evt, SkEventSinkID sinkID, SkMSec delay) { return evt->post(sinkID, delay); } |
| |
| // View hierarchy management |
| |
| /** Return the view's parent, or null if it has none. This does not affect the parent's reference count. */ |
| SkView* getParent() const { return fParent; } |
| SkView* attachChildToFront(SkView* child); |
| /** Attach the child view to this view, and increment the child's reference count. The child view is added |
| such that it will be drawn before all other child views. |
| The child view parameter is returned. |
| */ |
| SkView* attachChildToBack(SkView* child); |
| /** If the view has a parent, detach the view from its parent and decrement the view's reference count. |
| If the parent was the only owner of the view, this will cause the view to be deleted. |
| */ |
| void detachFromParent(); |
| /** Attach the child view to this view, and increment the child's reference count. The child view is added |
| such that it will be drawn after all other child views. |
| The child view parameter is returned. |
| */ |
| /** Detach all child views from this view. */ |
| void detachAllChildren(); |
| |
| /** Convert the specified point from global coordinates into view-local coordinates |
| */ |
| void globalToLocal(SkPoint* pt) const { if (pt) this->globalToLocal(pt->fX, pt->fY, pt); } |
| /** Convert the specified x,y from global coordinates into view-local coordinates, returning |
| the answer in the local parameter. |
| */ |
| void globalToLocal(SkScalar globalX, SkScalar globalY, SkPoint* local) const; |
| |
| /** \class F2BIter |
| |
| Iterator that will return each of this view's children, in |
| front-to-back order (the order used for clicking). The first |
| call to next() returns the front-most child view. When |
| next() returns null, there are no more child views. |
| */ |
| class F2BIter { |
| public: |
| F2BIter(const SkView* parent); |
| SkView* next(); |
| private: |
| SkView* fFirstChild, *fChild; |
| }; |
| |
| /** \class B2FIter |
| |
| Iterator that will return each of this view's children, in |
| back-to-front order (the order they are drawn). The first |
| call to next() returns the back-most child view. When |
| next() returns null, there are no more child views. |
| */ |
| class B2FIter { |
| public: |
| B2FIter(const SkView* parent); |
| SkView* next(); |
| private: |
| SkView* fFirstChild, *fChild; |
| }; |
| |
| /** \class Artist |
| |
| Install a subclass of this in a view (calling setArtist()), and then the |
| default implementation of that view's onDraw() will invoke this object |
| automatically. |
| */ |
| class Artist : public SkRefCnt { |
| public: |
| void draw(SkView*, SkCanvas*); |
| void inflate(const SkDOM&, const SkDOM::Node*); |
| protected: |
| virtual void onDraw(SkView*, SkCanvas*) = 0; |
| virtual void onInflate(const SkDOM&, const SkDOM::Node*); |
| }; |
| /** Return the artist attached to this view (or null). The artist's reference |
| count is not affected. |
| */ |
| Artist* getArtist() const; |
| /** Attach the specified artist (or null) to the view, replacing any existing |
| artist. If the new artist is not null, its reference count is incremented. |
| The artist parameter is returned. |
| */ |
| Artist* setArtist(Artist* artist); |
| |
| /** \class Layout |
| |
| Install a subclass of this in a view (calling setLayout()), and then the |
| default implementation of that view's onLayoutChildren() will invoke |
| this object automatically. |
| */ |
| class Layout : public SkRefCnt { |
| public: |
| void layoutChildren(SkView* parent); |
| void inflate(const SkDOM&, const SkDOM::Node*); |
| protected: |
| virtual void onLayoutChildren(SkView* parent) = 0; |
| virtual void onInflate(const SkDOM&, const SkDOM::Node*); |
| }; |
| |
| /** Return the layout attached to this view (or null). The layout's reference |
| count is not affected. |
| */ |
| Layout* getLayout() const; |
| /** Attach the specified layout (or null) to the view, replacing any existing |
| layout. If the new layout is not null, its reference count is incremented. |
| The layout parameter is returned. |
| */ |
| Layout* setLayout(Layout*, bool invokeLayoutNow = true); |
| /** If a layout is attached to this view, call its layoutChildren() method |
| */ |
| void invokeLayout(); |
| |
| /** Call this to initialize this view based on the specified XML node |
| */ |
| void inflate(const SkDOM& dom, const SkDOM::Node* node); |
| /** After a view hierarchy is inflated, this may be called with a dictionary |
| containing pairs of <name, view*>, where the name string was the view's |
| "id" attribute when it was inflated. |
| |
| This will call the virtual onPostInflate for this view, and the recursively |
| call postInflate on all of the view's children. |
| */ |
| void postInflate(const SkTDict<SkView*>& ids); |
| |
| SkDEBUGCODE(void dump(bool recurse) const;) |
| |
| protected: |
| /** Override this to draw inside the view. Be sure to call the inherited version too */ |
| virtual void onDraw(SkCanvas*); |
| /** Override this to be notified when the view's size changes. Be sure to call the inherited version too */ |
| virtual void onSizeChange(); |
| /** Override this if you want to handle an inval request from this view or one of its children. |
| Tyically this is only overridden by the by the "window". If your subclass does handle the |
| request, return true so the request will not continue to propogate to the parent. |
| */ |
| virtual bool handleInval(const SkRect*); |
| //! called once before all of the children are drawn (or clipped/translated) |
| virtual SkCanvas* beforeChildren(SkCanvas* c) { return c; } |
| //! called once after all of the children are drawn (or clipped/translated) |
| virtual void afterChildren(SkCanvas* orig) {} |
| |
| //! called right before this child's onDraw is called |
| virtual void beforeChild(SkView* child, SkCanvas* canvas) {} |
| //! called right after this child's onDraw is called |
| virtual void afterChild(SkView* child, SkCanvas* canvas) {} |
| |
| /** Override this if you might handle the click |
| */ |
| virtual Click* onFindClickHandler(SkScalar x, SkScalar y); |
| /** Override this to decide if your children are targets for a click. |
| The default returns true, in which case your children views will be |
| candidates for onFindClickHandler. Returning false wil skip the children |
| and just call your onFindClickHandler. |
| */ |
| virtual bool onSendClickToChildren(SkScalar x, SkScalar y); |
| /** Override this to track clicks, returning true as long as you want to track |
| the pen/mouse. |
| */ |
| virtual bool onClick(Click*); |
| /** Override this to initialize your subclass from the XML node. Be sure to call the inherited version too */ |
| virtual void onInflate(const SkDOM& dom, const SkDOM::Node* node); |
| /** Override this if you want to perform post initialization work based on the ID dictionary built |
| during XML parsing. Be sure to call the inherited version too. |
| */ |
| virtual void onPostInflate(const SkTDict<SkView*>&); |
| |
| public: |
| // default action is to inval the view |
| virtual void onFocusChange(bool gainFocusP); |
| protected: |
| |
| // override these if you're acting as a layer/host |
| virtual bool onGetFocusView(SkView**) const { return false; } |
| virtual bool onSetFocusView(SkView*) { return false; } |
| |
| private: |
| SkScalar fWidth, fHeight; |
| SkPoint fLoc; |
| SkView* fParent; |
| SkView* fFirstChild; |
| SkView* fNextSibling; |
| SkView* fPrevSibling; |
| uint8_t fFlags; |
| uint8_t fContainsFocus; |
| |
| friend class B2FIter; |
| friend class F2BIter; |
| |
| friend class SkLayerView; |
| |
| bool setFocusView(SkView* fvOrNull); |
| SkView* acceptFocus(FocusDirection); |
| void detachFromParent_NoLayout(); |
| }; |
| |
| #endif |
| |
