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atomize-element-interface #2

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sashakoshka merged 20 commits from atomize-element-interface into main 2023-01-16 10:24:23 -07:00
Conversation 0 Commits 20 Files Changed 25 +164 -158
4 changed files with 164 additions and 158 deletions
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100
element.go Normal file
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package tomo
// ParentHooks is a struct that contains callbacks that let child elements send
// information to their parent element without the child element knowing
// anything about the parent element or containing any reference to it. When a
// parent element adopts a child element, it must set these callbacks.
type ParentHooks struct {
// Draw is called when a part of the child element's surface is updated.
// The updated region will be passed to the callback as a sub-image.
Draw func (region Canvas)
// MinimumSizeChange is called when the child element's minimum width
// and/or height changes. When this function is called, the element will
// have already been resized and there is no need to send it a resize
// event.
MinimumSizeChange func (width, height int)
// SelectabilityChange is called when the chid element becomes
// selectable or non-selectable.
SelectabilityChange func (selectable bool)
// SelectionRequest is called when the child element element wants
// itself to be selected. If the parent element chooses to grant the
// request, it must send the child element a selection event and return
// true.
SelectionRequest func () (granted bool)
}
// RunDraw runs the Draw hook if it is not nil. If it is nil, it does nothing.
func (hooks ParentHooks) RunDraw (region Canvas) {
if hooks.Draw != nil {
hooks.Draw(region)
}
}
// RunMinimumSizeChange runs the MinimumSizeChange hook if it is not nil. If it
// is nil, it does nothing.
func (hooks ParentHooks) RunMinimumSizeChange (width, height int) {
if hooks.MinimumSizeChange != nil {
hooks.MinimumSizeChange(width, height)
}
}
// RunSelectionRequest runs the SelectionRequest hook if it is not nil. If it is
// nil, it does nothing.
func (hooks ParentHooks) RunSelectionRequest () (granted bool) {
if hooks.SelectionRequest != nil {
granted = hooks.SelectionRequest()
}
return
}
// RunSelectabilityChange runs the SelectionRequest hook if it is not nil. If it
// is nil, it does nothing.
func (hooks ParentHooks) RunSelectabilityChange (selectable bool) {
if hooks.SelectabilityChange != nil {
hooks.SelectabilityChange(selectable)
}
}
// Element represents a basic on-screen object.
type Element interface {
// Element must implement the Canvas interface. Elements should start
// out with a completely blank buffer, and only allocate memory and draw
// on it for the first time when sent an EventResize event.
Canvas
// Handle handles an event, propagating it to children if necessary.
Handle (event Event)
// Selectable returns whether this element can be selected. If this
// element contains other selectable elements, it must return true.
Selectable () (selectable bool)
// Selected returns whether or not this element is currently selected.
// This will always return false if it is not selectable.
Selected () (selected bool)
// If this element contains other elements, and one is selected, this
// method will advance the selection in the specified direction. If
// the element contains selectable elements but none of them are
// selected, it will select the first selectable element. If there are
// no more children to be selected in the specified direction, the
// element will return false. If the selection could be advanced, it
// will return true. If the element contains no selectable child
// elements, it will always return false.
AdvanceSelection (direction int) (ok bool)
// SetParentHooks gives the element callbacks that let it send
// information to its parent element without it knowing anything about
// the parent element or containing any reference to it. When a parent
// element adopts a child element, it must set these callbacks.
SetParentHooks (callbacks ParentHooks)
// MinimumSize specifies the minimum amount of pixels this element's
// width and height may be set to. If the element is given a resize
// event with dimensions smaller than this, it will use its minimum
// instead of the offending dimension(s).
MinimumSize () (width, height int)
}

25
layout.go Normal file
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package tomo
import "image"
// LayoutEntry associates an element with layout and positioning information so
// it can be arranged by a Layout.
type LayoutEntry struct {
Element
Position image.Point
Expand bool
}
// Layout is capable of arranging elements within a container. It is also able
// to determine the minimum amount of room it needs to do so.
type Layout interface {
// Arrange takes in a slice of entries and a bounding width and height,
// and changes the position of the entiries in the slice so that they
// are properly laid out. The given width and height should not be less
// than what is returned by MinimumSize.
Arrange (entries []LayoutEntry, width, height int)
// MinimumSize returns the minimum width and height that the layout
// needs to properly arrange the given slice of layout entries.
MinimumSize (entries []LayoutEntry) (width, height int)
}

158
tomo.go
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@ -1,165 +1,7 @@
package tomo
import "image"
import "errors"
// ParentHooks is a struct that contains callbacks that let child elements send
// information to their parent element without the child element knowing
// anything about the parent element or containing any reference to it. When a
// parent element adopts a child element, it must set these callbacks.
type ParentHooks struct {
// Draw is called when a part of the child element's surface is updated.
// The updated region will be passed to the callback as a sub-image.
Draw func (region Canvas)
// MinimumSizeChange is called when the child element's minimum width
// and/or height changes. When this function is called, the element will
// have already been resized and there is no need to send it a resize
// event.
MinimumSizeChange func (width, height int)
// SelectabilityChange is called when the chid element becomes
// selectable or non-selectable.
SelectabilityChange func (selectable bool)
// SelectionRequest is called when the child element element wants
// itself to be selected. If the parent element chooses to grant the
// request, it must send the child element a selection event and return
// true.
SelectionRequest func () (granted bool)
}
// RunDraw runs the Draw hook if it is not nil. If it is nil, it does nothing.
func (hooks ParentHooks) RunDraw (region Canvas) {
if hooks.Draw != nil {
hooks.Draw(region)
}
}
// RunMinimumSizeChange runs the MinimumSizeChange hook if it is not nil. If it
// is nil, it does nothing.
func (hooks ParentHooks) RunMinimumSizeChange (width, height int) {
if hooks.MinimumSizeChange != nil {
hooks.MinimumSizeChange(width, height)
}
}
// RunSelectionRequest runs the SelectionRequest hook if it is not nil. If it is
// nil, it does nothing.
func (hooks ParentHooks) RunSelectionRequest () (granted bool) {
if hooks.SelectionRequest != nil {
granted = hooks.SelectionRequest()
}
return
}
// RunSelectabilityChange runs the SelectionRequest hook if it is not nil. If it
// is nil, it does nothing.
func (hooks ParentHooks) RunSelectabilityChange (selectable bool) {
if hooks.SelectabilityChange != nil {
hooks.SelectabilityChange(selectable)
}
}
// Element represents a basic on-screen object.
type Element interface {
// Element must implement the Canvas interface. Elements should start
// out with a completely blank buffer, and only allocate memory and draw
// on it for the first time when sent an EventResize event.
Canvas
// Handle handles an event, propagating it to children if necessary.
Handle (event Event)
// Selectable returns whether this element can be selected. If this
// element contains other selectable elements, it must return true.
Selectable () (selectable bool)
// Selected returns whether or not this element is currently selected.
// This will always return false if it is not selectable.
Selected () (selected bool)
// If this element contains other elements, and one is selected, this
// method will advance the selection in the specified direction. If
// the element contains selectable elements but none of them are
// selected, it will select the first selectable element. If there are
// no more children to be selected in the specified direction, the
// element will return false. If the selection could be advanced, it
// will return true. If the element contains no selectable child
// elements, it will always return false.
AdvanceSelection (direction int) (ok bool)
// SetParentHooks gives the element callbacks that let it send
// information to its parent element without it knowing anything about
// the parent element or containing any reference to it. When a parent
// element adopts a child element, it must set these callbacks.
SetParentHooks (callbacks ParentHooks)
// MinimumSize specifies the minimum amount of pixels this element's
// width and height may be set to. If the element is given a resize
// event with dimensions smaller than this, it will use its minimum
// instead of the offending dimension(s).
MinimumSize () (width, height int)
}
// Window represents a top-level container generated by the currently running
// backend. It can contain a single element. It is hidden by default, and must
// be explicitly shown with the Show() method. If it contains no element, it
// displays a black (or transprent) background.
type Window interface {
// Adopt sets the root element of the window. There can only be one of
// these at one time.
Adopt (child Element)
// Child returns the root element of the window.
Child () (child Element)
// SetTitle sets the title that appears on the window's title bar. This
// method might have no effect with some backends.
SetTitle (title string)
// SetIcon taks in a list different sizes of the same icon and selects
// the best one to display on the window title bar, dock, or whatever is
// applicable for the given backend. This method might have no effect
// for some backends.
SetIcon (sizes []image.Image)
// Show shows the window. The window starts off hidden, so this must be
// called after initial setup to make sure it is visible.
Show ()
// Hide hides the window.
Hide ()
// Close closes the window.
Close ()
// OnClose specifies a function to be called when the window is closed.
OnClose (func ())
}
// LayoutEntry associates an element with layout and positioning information so
// it can be arranged by a Layout.
type LayoutEntry struct {
Element
Position image.Point
Expand bool
}
// Layout is capable of arranging elements within a container. It is also able
// to determine the minimum amount of room it needs to do so.
type Layout interface {
// Arrange takes in a slice of entries and a bounding width and height,
// and changes the position of the entiries in the slice so that they
// are properly laid out. The given width and height should not be less
// than what is returned by MinimumSize.
Arrange (entries []LayoutEntry, width, height int)
// MinimumSize returns the minimum width and height that the layout
// needs to properly arrange the given slice of layout entries.
MinimumSize (entries []LayoutEntry) (width, height int)
}
var backend Backend
// Run initializes a backend, calls the callback function, and begins the event

39
window.go Normal file
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package tomo
import "image"
// Window represents a top-level container generated by the currently running
// backend. It can contain a single element. It is hidden by default, and must
// be explicitly shown with the Show() method. If it contains no element, it
// displays a black (or transprent) background.
type Window interface {
// Adopt sets the root element of the window. There can only be one of
// these at one time.
Adopt (child Element)
// Child returns the root element of the window.
Child () (child Element)
// SetTitle sets the title that appears on the window's title bar. This
// method might have no effect with some backends.
SetTitle (title string)
// SetIcon taks in a list different sizes of the same icon and selects
// the best one to display on the window title bar, dock, or whatever is
// applicable for the given backend. This method might have no effect
// for some backends.
SetIcon (sizes []image.Image)
// Show shows the window. The window starts off hidden, so this must be
// called after initial setup to make sure it is visible.
Show ()
// Hide hides the window.
Hide ()
// Close closes the window.
Close ()
// OnClose specifies a function to be called when the window is closed.
OnClose (func ())
}