Diff

Differences From Artifact [128d0bd137]:

To Artifact [352165b2a4]:


1
2
3
4
5
6
7
8
9

10
11

12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

27
28
29
30
31

32





Design of an immediate graphical user interface api with managed layouts

Terms:

1. Canvas - a drawing area with a managed layout

User stories

1. I would like to call UI-rendering functions without specifying dimensions and locations

2. I would like to call custom UI-rendering functions while specifying dimensions and locations


Story 2 needs a way to get a proper starting location or a bounding box If 1 is in place.

Consider the single method Layout interface:

type Layout interface {
	// Advances the layout and returns a starting point
	// for an element based on the last ending point.
	Next(Point) Point
}

Story 1 necessitates that library-aware UI-rendering functions acquire their starting locations
on their own. This allows for the following two approaches (more are possible of course)

* Store the ending point of the last element. New calls can get it and pass it to the layout
  + does not advance the layout unless required, saving cpu


* Store the next starting point by calling Next() at the end of the element drawing routine.
The next drawing can continue from it.
  - advancing the layout costs cpu
  - the user might want an out of layer render











|




>


>







|







>





>

>
>
>
>
>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
Design of an immediate graphical user interface api with managed layouts

Terms:

1. Canvas - a drawing area

User stories

1. I would like to call UI-rendering functions without specifying dimensions and locations

2. I would like to call custom UI-rendering functions while specifying dimensions and locations

/----------------------------------
Story 2 needs a way to get a proper starting location or a bounding box If 1 is in place.

Consider the single method Layout interface:

type Layout interface {
	// Advances the layout and returns a starting point
	// for an element based on the last ending point.
	Next(last Point) Point
}

Story 1 necessitates that library-aware UI-rendering functions acquire their starting locations
on their own. This allows for the following two approaches (more are possible of course)

* Store the ending point of the last element. New calls can get it and pass it to the layout
  + does not advance the layout unless required, saving cpu
  + does not imply a dependency on the layout, the UI drawing needs just a starting point

* Store the next starting point by calling Next() at the end of the element drawing routine.
The next drawing can continue from it.
  - advancing the layout costs cpu
  - the user might want an out of layer render
  - puts a dependency on the layout

The first strategy is definatelly more sound and neatly allows for a layout-aware tracker
to handle the locations.
\----------------------------------

3. I would like to enhance drawing functions with additional behavior (e.g. layout trackers, styling, etc)