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Size: 1950
Comment:
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Size: 1962
Comment:
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| || non || Space bar || false || 0 || | || non || Space bar || false || 0 || zoom out || |
How to make new tools
The best is to derive from existing tools, and redefine only what you don't like. The tools often function within a group of tools. They share a common way of using mouse buttons, and it is oke to push a tool unto the stack, and returning to the parent tool after stopping itself. Like tools based on a2dStTool use all as controller a2dStToolContr.
Changing State
A tool is used to manipulate what is in a drawing. User input combined with selected objects and mouse hit objects, brings a tool from one state into another. Down here some examples of what can bring a tool into a different state.
mouse event |
key state |
object hit |
object selected |
action |
|
true |
1 |
Select object hit |
|
|
true |
1 |
depends on drag or not |
|
Ctrl Down |
true |
1 |
deselect all & add hit object |
|
LeftDown + drag |
Ctrl Down |
true |
0 |
deselect all & add selected objects |
LeftDown + drag |
Shift Down |
true |
0 |
add selected objects in rect |
LeftDown + drag |
Alt Down |
true |
n >= 1 |
move selected objects |
RightDown + drag |
Ctrl Down |
true |
1 |
drag canvas area |
Alt Down |
true |
1 |
select |
|
Alt Down |
true |
0 |
popup menu |
|
|
true |
1 |
depending on keys, treat dragged rect |
|
non |
Space bar |
false |
0 |
zoom out |
Tool state
Zoom Tool
