散景自定义保存工具

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【中文标题】散景自定义保存工具【英文标题】:Bokeh Custom Save Tool 【发布时间】:2017-09-07 13:53:06 【问题描述】:

我正在尝试在散景中创建自定义保存工具,这就是我所拥有的:

class NewSaveTool(Tool):
    JS_CODE = """
        import * as p from "core/properties"
        import ActionTool, ActionToolView from "models/tools/actions/action_tool"
        export class NewSaveToolView extends ActionToolView
            do: () -> 
                save_name = @model.source
                @plot_view.save(save_name)

        export class NewSaveTool extends ActionTool
            default_view: NewSaveToolView
            type: "SaveTool"
            tool_name: "Save"
            icon: "bk-tool-icon-save"
            @define 
                source: [ p.String ]
            
    """
    source = String
    __implementation__ = JS_CODE

该工具加载并在工具栏中,但是当我单击按钮时,我得到了

Uncaught TypeError: this.plot_view.save is not a function

这就是源码中保存工具使用的确切功能,那么有谁知道为什么它在这种情况下不起作用?

【问题讨论】:

【参考方案1】:

回答这个问题太晚了,因为我花了太多时间才使它起作用。 这里的主要变化是“do”到“doit”,虽然老实说我不确定指定的错误来自哪里,这是我从未遇到过的少数错误之一。

一个有效的实现(至少在 bokeh 12.13 上)是:

JS_CODE_SAVE = """
import * as p from "core/properties"
import ActionTool, ActionToolView from "models/tools/actions/action_tool"

export class NewSaveView extends ActionToolView

  # this is executed when the button is clicked
  doit: () ->
    @plot_view.save(@model.save_name)

export class NewSave extends ActionTool
  default_view: NewSaveView
  type: "NewSave"

  tool_name: "Save"
  icon: "bk-tool-icon-save"

  @define  save_name: [ p.String ] 
"""

class NewSave(Tool):
    """
    Save a plot with a custom name.
    Usage: NewSaveTool(save_name=name)
    """
    __implementation__ = JS_CODE_SAVE
    save_name = String()

实现为:tools = [CustomSaveTool(savename='custom name')]

要真正动态更改保存名称,您必须更改 savename 属性,例如在小部件回调函数中:plot.tools[0].save_name = 'new save name'

【讨论】:

不是答案,只是澄清——我认为“do”是 JS 中的保留字,是 do...while 循环结构的一部分。【参考方案2】:

太棒了!有用! 关于上面的使用示例,只需注释一下,应该是:

tools = [NewSave(savename='custom name')]

这是一个完整的工作示例(使用 CustomSaveTool 作为类名):

from bokeh.models import Tool, String
from bokeh.plotting import figure
from bokeh.io import show

JS_CODE_SAVE = """
import * as p from "core/properties"
import ActionTool, ActionToolView from "models/tools/actions/action_tool"

export class NewSaveView extends ActionToolView

  # this is executed when the button is clicked
  doit: () ->
    @plot_view.save(@model.save_name)

export class CustomSaveTool extends ActionTool
  default_view: NewSaveView
  type: "CustomSaveTool"

  tool_name: "Save"
  icon: "bk-tool-icon-save"

  @define  save_name: [ p.String ]  """

class CustomSaveTool(Tool):
    """
    Save a plot with a custom name.
    Usage: CustomSaveTool(save_name = name)
    """
    __implementation__ = JS_CODE_SAVE
    save_name = String()

tools = [CustomSaveTool(save_name = 'custom name 1')]
plot = figure(x_range = (0, 10), y_range = (0, 10), tools = tools)
plot.line(x = [1, 2, 3], y = [4, 5, 6])
plot.tools[0].save_name = 'custom name 2'
show(plot)

【讨论】:

【参考方案3】:

初始响应中给出的实现不适用于更新版本的散景。

这是基于原始 SaveTool 代码的更新版本。它公开了一个可以在 Python 中设置的 save_name 属性:

from bokeh.models import ActionTool
from bokeh.util.compiler import TypeScript
from bokeh.core.properties import String

CUSTOM_SAVE_TS = """
import ActionTool, ActionToolView from "models/tools/actions/action_tool"
import * as p from "core/properties"
import tool_icon_save from "styles/icons.css"

export class CustomSaveToolView extends ActionToolView 
  model: CustomSaveTool

  async save(name: string): Promise<void> 
    const blob = await this.plot_view.to_blob()
    const link = document.createElement("a")
    link.href = URL.createObjectURL(blob)
    link.download = name // + ".png" | "svg" (inferred from MIME type)
    link.target = "_blank"
    link.dispatchEvent(new MouseEvent("click"))
  

  doit(): void 
    this.save(this.model.save_name)
  


export namespace CustomSaveTool 
  export type Attrs = p.AttrsOf<Props>

  export type Props = ActionTool.Props & 
    save_name: p.Property<string>
   


export interface CustomSaveTool extends CustomSaveTool.Attrs 

export class CustomSaveTool extends ActionTool 
  properties: CustomSaveTool.Props 
  __view_type__: CustomSaveToolView

  constructor(attrs?: Partial<CustomSaveTool.Attrs>) 
    super(attrs)
  

  static init_CustomSaveTool(): void 
    this.prototype.default_view = CustomSaveToolView

    this.register_alias("save", () => new CustomSaveTool())

    this.define<CustomSaveTool.Props>((String) => (
      save_name: [ String ],
    ))
  

  tool_name = "Custom Save"
  icon = tool_icon_save


"""

class CustomSaveTool(ActionTool):
    """Modified save tool allowing custom file names"""
    __implementation__ = TypeScript(CUSTOM_SAVE_TS)
    save_name = String()

save_tool = CustomSaveTool(save_name='custom_filename')

请注意,与原始 SaveTool 代码相比,我不得不废弃与“复制”功能相关的部分,我认为无论如何都不会真正使用。

【讨论】:

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