Golang DataBinder.DataSource方法代碼示例

//.........這裏部分代碼省略.........
			dataBinder, layout, children := dc.ContainerInfo()

			if layout != nil {
				l, err := layout.Create()
				if err != nil {
					return err
				}

				if err := wc.SetLayout(l); err != nil {
					return err
				}
			}

			b.parent = wc
			defer func() {
				b.parent = oldParent
			}()

			if g, ok := layout.(Grid); ok {
				columns := b.columns
				defer func() {
					b.columns, b.row, b.col = columns, row, column+columnSpan
				}()

				b.columns = g.Columns
				b.row = 0
				b.col = 0
			}

			for _, child := range children {
				if err := child.Create(b); err != nil {
					return err
				}
			}

			if dataBinder.AssignTo != nil || dataBinder.DataSource != nil {
				if dataB, err := dataBinder.create(); err != nil {
					return err
				} else {
					db = dataB
				}
			}
		}
	}

	// Custom
	if customInit != nil {
		if err := customInit(); err != nil {
			return err
		}
	}

	b.parent = oldParent

	// Widget continued
	if font != nil {
		if f, err := font.Create(); err != nil {
			return err
		} else if f != nil {
			w.SetFont(f)
		}
	}

	if b.level == 1 {
		if err := b.initProperties(); err != nil {
			return err
		}
	}

	// Call Reset on DataBinder after customInit, so a Dialog gets a chance to first
	// wire up its DefaultButton to the CanSubmitChanged event of a DataBinder.
	if db != nil {
		if _, ok := d.(Container); ok {
			if wc, ok := w.(walk.Container); ok {
				b.Defer(func() error {
					// FIXME: Currently SetDataBinder must be called after initProperties.
					wc.SetDataBinder(db)

					if db.DataSource() == nil {
						return nil
					}

					return db.Reset()
				})
			}
		}
	}

	if b.level == 1 {
		for _, f := range b.deferredFuncs {
			if err := f(); err != nil {
				return err
			}
		}
	}

	succeeded = true

	return nil
}

func (d Dialog) Create(owner walk.Form) error {
	var w *walk.Dialog
	var err error

	if d.FixedSize {
		w, err = walk.NewDialogWithFixedSize(owner)
	} else {
		w, err = walk.NewDialog(owner)
	}

	if err != nil {
		return err
	}

	tlwi := topLevelWindowInfo{
		Name:             d.Name,
		Font:             d.Font,
		ToolTipText:      "",
		MinSize:          d.MinSize,
		MaxSize:          d.MaxSize,
		ContextMenuItems: d.ContextMenuItems,
		DataBinder:       d.DataBinder,
		Layout:           d.Layout,
		Children:         d.Children,
		OnKeyDown:        d.OnKeyDown,
		OnKeyPress:       d.OnKeyPress,
		OnKeyUp:          d.OnKeyUp,
		OnMouseDown:      d.OnMouseDown,
		OnMouseMove:      d.OnMouseMove,
		OnMouseUp:        d.OnMouseUp,
		OnSizeChanged:    d.OnSizeChanged,
	}

	var db *walk.DataBinder
	if d.DataBinder.AssignTo == nil {
		d.DataBinder.AssignTo = &db
	}

	builder := NewBuilder(nil)

	w.SetSuspended(true)
	builder.Defer(func() error {
		w.SetSuspended(false)
		return nil
	})

	return builder.InitWidget(tlwi, w, func() error {
		if err := w.SetTitle(d.Title); err != nil {
			return err
		}

		if err := w.SetSize(d.Size.toW()); err != nil {
			return err
		}

		if d.DefaultButton != nil {
			if err := w.SetDefaultButton(*d.DefaultButton); err != nil {
				return err
			}

			if db := *d.DataBinder.AssignTo; db != nil {
				if db.DataSource() != nil {
					(*d.DefaultButton).SetEnabled(db.CanSubmit())
				}

				db.CanSubmitChanged().Attach(func() {
					(*d.DefaultButton).SetEnabled(db.CanSubmit())
				})
			}
		}
		if d.CancelButton != nil {
			if err := w.SetCancelButton(*d.CancelButton); err != nil {
				return err
			}
		}

		if d.AssignTo != nil {
			*d.AssignTo = w
		}

		return nil
	})
}