CN102799581B - A kind of system and method realizing cross-platform graphic library - Google Patents
A kind of system and method realizing cross-platform graphic library Download PDFInfo
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- CN102799581B CN102799581B CN201110133570.4A CN201110133570A CN102799581B CN 102799581 B CN102799581 B CN 102799581B CN 201110133570 A CN201110133570 A CN 201110133570A CN 102799581 B CN102799581 B CN 102799581B
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Abstract
The invention discloses a kind of system and method realizing cross-platform graphic library, for areas of information technology, not to be suitable for the deficiency of embedded system development for cross-platform graphic library in prior art, a kind of new cross-platform graphic library is proposed, complete set is provided and unified development interface for using the developer of this shape library, and be applicable to for different system platforms, make shape library can call primary pattern library function based on this platform.Described system comprises: platform independent stratum, is used for as user provides development interface api function; Platform relevant layers, is used for docking with the described api function of described platform independent stratum, and carries out alternately with the ecosystem pattern library function of particular platform.The shape library system very light weight of the embodiment of the present invention, is applicable to embedded device application; Expand conveniently simultaneously, be easy to add new system platform.
Description
Technical field
The present invention relates to a kind of areas of information technology, particularly relate to a kind of system and method realizing cross-platform graphic library.
Background technology
When developing cross-platform application program with programming language tools, often running into application program needs for code for this platform write by different platforms, and graphical user interface (being called for short GUI) code is write in the most outstanding representative.If GUI demand is once change, the correlative code of all platforms all needs to make corresponding amendment.So not only take time and effort, easily make mistakes again, the management of code also can be affected, and from then on can reduce development efficiency simultaneously.A kind of method solving this problem uses cross-platform shape library interface to develop cross-platform application program, cross-platform graphic library provides unified DLL (dynamic link library) to developer, simultaneously in specific implementation, carries out different realizations according to the difference of operating system.
For C++, having a lot at present take C++ as the cross-platform graphic library of development language, and wherein typical representative has Qt and wxWidget.Qt is cross-platform C++ class storehouse, can use on the Mainstream Platforms such as Windows, Linux.Qt, except comprising shape library, additionally provides cross-platform base library, as array, storehouse or thread etc.WxWidget is also the figure class libraries for different platform design, and the design and use style of wxWidget is similar to MFC, and different is that wxWidget may operate in different system platforms.No matter be Qt or wxWidget, its complexity is high is not suitable for the embedded device applying to resource-constrained.Trixul is also the cross-platform graphic library of writing with C++, and C++ code and JavaScript code merge by the JavaScript engine technique that Trixul have employed Mozilla, simplify the complicacy of graphic designs.Weak point Trixul needs the support of JS engine can realize alternately, this common applications design in not necessarily.
Summary of the invention
The object of the invention is the deficiency not being suitable for embedded system development for cross-platform graphic library in prior art, a kind of new cross-platform graphic library is proposed, complete set is provided and unified development interface for using the developer of this shape library, and be applicable to for different system platforms, make shape library can call primary pattern library function based on this platform.
In order to reach foregoing invention object, the present invention proposes a kind of system realizing cross-platform graphic library, described system is realized by following technical scheme:
Realize a system for cross-platform graphic library, described system comprises:
Platform independent stratum, is used for as user provides development interface api function;
Platform relevant layers, is used for docking with the described api function of described platform independent stratum, and carries out alternately with the ecosystem pattern library function of particular platform.
Further preferably, described platform relevant layers specifically comprises:
Api function realizes module, is used for docking to the corresponding api function of described platform independent stratum, realizes the calling function of api function;
Platform communication module, is used for carrying out alternately with the ecosystem pattern library function of described particular platform, receives the signal and event that are fed back by ecosystem shape library control, calls provide interface for user realizes api function.
In order to realize aforementioned invention object, the embodiment of the present invention additionally provides a kind of method realizing cross-platform graphic library, said method comprising the steps of:
When the api function that user carries out graphical development calls, platform independent stratum provides a corresponding api function calling interface;
Platform relevant layers is docked with platform independent stratum according to described api function, and carries out alternately with the ecosystem pattern library function of particular platform.
Further preferably, described platform relevant layers is docked with platform independent stratum according to described api function, and carries out specifically comprising alternately with the ecosystem pattern library function of particular platform:
Platform relevant layers is docked to the corresponding api function of described platform independent stratum, realizes the calling function of api function;
The ecosystem pattern library function of platform relevant layers and described particular platform carries out alternately, receives the signal and event that are fed back by ecosystem shape library control, calls provide interface for user realizes api function.
Compared with prior art, the system architecture of the cross-platform graphic library of embodiment of the present invention proposition is divided into platform independent stratum and platform relevant layers two large divisions.Code in platform independent stratum is mainly development interface that user provides: these interfaces be complete, independently, during exploitation cross-platform program, developer should call api function corresponding in this layer; The code of platform relevant layers is mainly used in carrying out alternately with the ecosystem pattern library function of particular platform.Module in this layer is connected to module corresponding to platform independent stratum on the one hand, achieves the concrete function that these modules should realize; On the other hand, the shape library of particular platform ecosystem of the model calling in this layer, is used as the passage that platform independent stratum provides information feed back, makes the shape library control of particular platform can send event response to cross-platform graphic library control.Therefore, the shape library system very light weight of the embodiment of the present invention, is applicable to embedded device application; Expand conveniently simultaneously, be easy to add new system platform.
Accompanying drawing explanation
By the description carried out its exemplary embodiment below in conjunction with accompanying drawing, the above-mentioned feature and advantage of the present invention will become apparent and easy understand.
Fig. 1 is the system composition schematic diagram that the embodiment of the present invention 1 one kinds realizes cross-platform graphic library;
Fig. 2 is the another kind of a kind of system composition schematic diagram realizing cross-platform graphic library of the embodiment of the present invention 2;
Fig. 3 is the primary structure figure that the embodiment of the present invention 3 cross-platform graphic library realizes a cross-platform button control;
Fig. 4 is the initialization figure that the embodiment of the present invention 3 cross-platform graphic library realizes a cross-platform button control;
Fig. 5 is the calling sequence figure of platform independent stratum to platform relevant layers that the embodiment of the present invention 4 cross-platform graphic library realizes a cross-platform button control;
Fig. 6 is the event call-back sequence chart that the embodiment of the present invention 5 cross-platform graphic library realizes a cross-platform button control.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, for the embodiment of the present invention 1 one kinds realizes the system composition schematic diagram of cross-platform graphic library.A kind of cross-platform graphic library that realizes, described system comprises:
Platform independent stratum, is used for as user provides development interface api function;
Platform relevant layers, is used for docking with the described api function of described platform independent stratum, and carries out alternately with the ecosystem pattern library function of particular platform.
Further preferably, described platform relevant layers specifically comprises:
Api function realizes module, is used for docking to the corresponding api function of described platform independent stratum, realizes the calling function of api function;
Platform communication module, is used for carrying out alternately with the ecosystem pattern library function of described particular platform, receives the signal and event that are fed back by ecosystem shape library control, calls provide interface for user realizes api function.
The embodiment of the present invention is to realize Button control, and the Button in platform independent stratum is available to the cross-platform button control that user uses.Widget and Control in this layer is also cross-platform control, lists here just in order to Button and their logical relation in shape library are described.By Buttonlmpl interface, the realization (as above WindowsButtonlmpl and GtkButtonlmpl of figure) of the button control of particular platform can be carried out for different platform in platform relevant layers; On reception event response, Button realizes ButtonEventObserver interface, for receiving the signal and event that are fed back by ecosystem shape library control, for user's realization event readjustment provides interface.
When user's initialization Button control, the specific assembly of cross-platform graphic library request completes the establishment of Button control.This assembly according to residing particular platform, can create the Buttonlmpl object instance on this platform.
If user calls the relevant function (user on windows platform might as well be established to call the SetText method of Button control) of Button, so this calls finally meeting performed by the specific GUI of platform.Detailed process is: Button calls the SetText method in Buttonlmpl, and because C++ inherits and polymorphic characteristic, this calls and can be called by the special object of platform relevant layers, is WindowsButtonlmpl::SetText here.Request forward can be given the ecosystem shape library control (WinForm::Button) contained by self by WindowsButtonlmpl further, calls the SetText method of this control.Through above-mentioned steps, can implementation platform independent stratum calling to platform relevant layers.Figure below is that this sequence chart called represents.
In the process problem of signal, complete signal from platform relevant layers to the loopback of platform independent stratum mainly through CallbackHelper and supplementary structure.When initialization control, the CallbackHelper of particular platform can associate with ecosystem control, thus realizes catching the signal that ecosystem control sends.When system ecosystem control sends signal (WinForm::Button sends ButtonPressed signal), the CallbackHelper object of particular platform will capture this signal, and call the OnButtonPressed function of self.OnButtonPressed will call the HandleCommand method of the WindowsButtonlmpl object that CallbackHelper points to.In HandleCommand, WindowsButtonlmpl will call the NotifyButtonPressed method of ButtonEventSubject, and the method finally have invoked the ButtonPressed of ButtonEventObserver.Because Button achieves ButtonEventObserver, the therefore signal message that will receive from WinForm of Button, thus achieve message from particular platform to the transmission of independent platform.In this way, user just can at the event response of platform independent stratum design control, and not need specifically to realize for different platform.Figure below is that the sequence chart of event call-back represents.
The system realizing cross-platform graphic library of the embodiment of the present invention is divided into platform independent stratum and platform relevant layers two large divisions.Code in platform independent stratum is mainly development interface that user provides: these interfaces be complete, independently, during exploitation cross-platform program, developer should call api function corresponding in this layer; The code of platform relevant layers is mainly used in carrying out alternately with the ecosystem pattern library function of particular platform.Module in this layer is connected to module corresponding to platform independent stratum on the one hand, achieves the concrete function that these modules should realize; On the other hand, the shape library of particular platform ecosystem of the model calling in this layer, is used as the passage that platform independent stratum provides information feed back, makes the shape library control of particular platform can send event response to cross-platform graphic library control.Therefore, the shape library system very light weight of the embodiment of the present invention, is applicable to embedded device application; Expand conveniently simultaneously, be easy to add new system platform.Described design structuring is good, and simultaneously in platform extended problem, this embodiment has good extensibility.Only need the module of adding platform relevant layers, just can realize specific shape library control in new system platform.Belong to the part in general frame due to the module of newly adding, therefore can reduce the development effort of developer.
As shown in Figure 4, the embodiment of the present invention 4 is a kind of method realizing cross-platform graphic library of the present invention, said method comprising the steps of:
When the api function that user carries out graphical development calls, platform independent stratum provides a corresponding api function calling interface;
Platform relevant layers is docked with platform independent stratum according to described api function, and carries out alternately with the ecosystem pattern library function of particular platform.
Further preferably, described platform relevant layers is docked with platform independent stratum according to described api function, and carries out specifically comprising alternately with the ecosystem pattern library function of particular platform:
Platform relevant layers is docked to the corresponding api function of described platform independent stratum, realizes the calling function of api function;
The ecosystem pattern library function of platform relevant layers and described particular platform carries out alternately, receives the signal and event that are fed back by ecosystem shape library control, calls provide interface for user realizes api function.
The embodiment of the present invention is to realize Button control, and the Button in platform independent stratum is available to the cross-platform button control that user uses.Widget and Control in this layer is also cross-platform control, lists here just in order to Button and their logical relation in shape library are described.By Buttonlmpl interface, the realization (as above WindowsButtonlmpl and GtkButtonlmpl of figure) of the button control of particular platform can be carried out for different platform in platform relevant layers; On reception event response, Button realizes ButtonEventObserver interface, for receiving the signal and event that are fed back by ecosystem shape library control, for user's realization event readjustment provides interface.
When user's initialization Button control, the specific assembly of cross-platform graphic library request completes the establishment of Button control.This assembly according to residing particular platform, can create the Buttonlmpl object instance on this platform.
If user calls the relevant function (user on windows platform might as well be established to call the SetText method of Button control) of Button, so this calls finally meeting performed by the specific GUI of platform.Detailed process is: Button calls the SetText method in Buttonlmpl, and because C++ inherits and polymorphic characteristic, this calls and can be called by the special object of platform relevant layers, is WindowsButtonlmpl::SetText here.Request forward can be given the ecosystem shape library control (WinForm::Button) contained by self by WindowsButtonlmpl further, calls the SetText method of this control.Through above-mentioned steps, can implementation platform independent stratum calling to platform relevant layers.Figure below is that this sequence chart called represents.
In the process problem of signal, complete signal from platform relevant layers to the loopback of platform independent stratum mainly through CallbackHelper and supplementary structure.When initialization control, the CallbackHelper of particular platform can associate with ecosystem control, thus realizes catching the signal that ecosystem control sends.When system ecosystem control sends signal (WinForm::Button sends ButtonPressed signal), the CallbackHelper object of particular platform will capture this signal, and call the OnButtonPressed function of self.OnButtonPressed will call the HandleCommand method of the WindowsButtonlmpl object that CallbackHelper points to.In HandleCommand, WindowsButtonlmpl will call the NotifyButtonPressed method of ButtonEventSubject, and the method finally have invoked the ButtonPressed of ButtonEventObserver.Because Button achieves ButtonEventObserver, the therefore signal message that will receive from WinForm of Button, thus achieve message from particular platform to the transmission of independent platform.In this way, user just can at the event response of platform independent stratum design control, and not need specifically to realize for different platform.Figure below is that the sequence chart of event call-back represents.
The method realizing cross-platform graphic library of the embodiment of the present invention, realizes being completed respectively by platform independent stratum and platform relevant layers by calling of graphical api function.Code in platform independent stratum is mainly development interface that user provides: these interfaces be complete, independently, during exploitation cross-platform program, developer should call api function corresponding in this layer; The code of platform relevant layers is mainly used in carrying out alternately with the ecosystem pattern library function of particular platform.Module in this layer is connected to module corresponding to platform independent stratum on the one hand, achieves the concrete function that these modules should realize; On the other hand, the shape library of particular platform ecosystem of the model calling in this layer, is used as the passage that platform independent stratum provides information feed back, makes the shape library control of particular platform can send event response to cross-platform graphic library control.Therefore, the shape library system very light weight of the embodiment of the present invention, is applicable to embedded device application; Expand conveniently simultaneously, be easy to add new system platform.Described design structuring is good, and simultaneously in platform extended problem, this embodiment has good extensibility.Only need the module of adding platform relevant layers, just can realize specific shape library control in new system platform.Belong to the part in general frame due to the module of newly adding, therefore can reduce the development effort of developer.
It should be noted that; above content is in conjunction with concrete embodiment further description made for the present invention; can not assert that the specific embodiment of the present invention is only limitted to this; under above-mentioned guidance of the present invention; those skilled in the art can carry out various improvement and distortion on the basis of above-described embodiment, and these improve or distortion drops in protection scope of the present invention.
Claims (2)
1. realize a system for cross-platform graphic library, it is characterized in that, described system comprises:
Platform independent stratum, is used for as user provides development interface api function;
Platform relevant layers, is used for docking with the described api function of described platform independent stratum, and carries out alternately with the ecosystem pattern library function of particular platform,
Described platform relevant layers specifically comprises:
Api function realizes module, is used for docking to the corresponding api function of described platform independent stratum, realizes the calling function of api function;
Platform communication module, is used for carrying out alternately with the ecosystem pattern library function of described particular platform, receives the signal and event that are fed back by ecosystem shape library control, calls provide interface for user realizes api function.
2. realize a method for cross-platform graphic library, it is characterized in that, described method comprises:
When the api function that user carries out graphical development calls, platform independent stratum provides a corresponding api function calling interface;
Platform relevant layers is docked with platform independent stratum according to described api function, and carries out alternately with the ecosystem pattern library function of particular platform,
Described platform relevant layers is docked with platform independent stratum according to described api function, and carries out specifically comprising alternately with the ecosystem pattern library function of particular platform:
Platform relevant layers is docked to the corresponding api function of described platform independent stratum, realizes the calling function of api function;
The ecosystem pattern library function of platform relevant layers and described particular platform carries out alternately, receives the signal and event that are fed back by ecosystem shape library control, calls provide interface for user realizes api function.
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