Started a new example for showing off OpenType features. This just lays out the UI and draws the string.

This commit is contained in:
Pietro Gagliardi 2017-06-10 23:33:25 -04:00
parent 39530a0a2e
commit 8728dcb5c0
4 changed files with 188 additions and 3 deletions

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@ -18,7 +18,7 @@ libui uses K&R C formatting rules for overall code structure: spaces after keywo
Use hard tabs, NOT spaces, for indentation. I use a proportional-width font and my text editor doesn't set tabs to a multiple of the space width, so I *will* be able to tell. If you use a fixed-width font, I suggest setting a tab width of 4 spaces per tab, but don't put diagrams in comments with hard tabs, because not everyone does this.
Expressions should have a spce around binary operators, and use parentheses where it would help humans gather the meaning of an expression, regardless of whether a computer could tell what is correct.
Expressions should have a space around binary operators, and use parentheses where it would help humans gather the meaning of an expression, regardless of whether a computer could tell what is correct.
When breaking expressions into multiple lines, always break *after* an operator, such as `,` or `&&`.
@ -40,6 +40,10 @@ Acronyms should **NOT** be mixed-case. `http` for the first word in a camel-case
(TODO I am writing an API documentation tool; once that becomes stable enough I can talk about documenting libui properly. You'll see vestiges of it throughout ui.h, though.)
### Other commenting
(TODO write this part)
### Compatibility
libui takes backward compatibility seriously. Your code should not break the current compatibility requirements. All platforms provide a series of macros, defined in the various `uipriv_*.h` files (or `winapi.hpp` on Windows), that specify the minimum required version. If you find yourself needing to remove these or ignore resultant warnings or errors, you're probably breaking compatibility.

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@ -6,7 +6,7 @@ This README is being written.<br>
## Announcements
* **TODO**
* Introduced an all-new formatted text API that allows you to process formatted text in ways that the old API wouldn't allow. You can read on the whole API [here](TODO).
* Introduced an all-new formatted text API that allows you to process formatted text in ways that the old API wouldn't allow. You can read on the whole API [here](TODO). There are also two new examples for this new api: `drawtext` (which shows the whole API at a glance) and `opentype` (which focuses on OpenType features).
* Also introduced a formal set of contribution guidelines, see `CONTRIBUTING.md` for details.
* **27 November 2016**

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@ -42,9 +42,17 @@ _add_example(drawtext
target_include_directories(drawtext
PRIVATE drawtext)
_add_example(opentype
opentype/main.c
${_EXAMPLE_RESOURCES_RC}
)
target_include_directories(opentype
PRIVATE opentype)
add_custom_target(examples
DEPENDS
controlgallery
histogram
cpp-multithread
drawtext)
drawtext
opentype)

173
examples/opentype/main.c Normal file
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@ -0,0 +1,173 @@
// 10 june 2017
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include "../../ui.h"
uiWindow *mainwin;
uiFontButton *fontButton;
uiEntry *textEntry;
uiCheckbox *nullFeatures;
uiArea *area;
uiAttributedString *attrstr = NULL;
static void remakeAttrStr(void)
{
char *text;
uiOpenTypeFeatures *otf;
uiAttributeSpec spec;
if (attrstr != NULL)
uiFreeAttributedString(attrstr);
text = uiEntryText(textEntry);
attrstr = uiNewAttributedString(text);
uiFreeText(text);
if (!uiCheckboxChecked(nullFeatures)) {
otf = uiNewOpenTypeFeatures();
// TODO
spec.Type = uiAttributeFeatures;
spec.Features = otf;
uiAttributedStringSetAttribute(attrstr, &spec,
0, uiAttributedStringLen(attrstr));
// and uiAttributedString copied otf
uiFreeOpenTypeFeatures(otf);
}
uiAreaQueueRedrawAll(area);
}
// TODO make a variable of main()? in all programs?
static uiAreaHandler handler;
static void handlerDraw(uiAreaHandler *a, uiArea *area, uiAreaDrawParams *p)
{
uiDrawTextLayout *layout;
uiDrawTextLayoutParams lp;
uiDrawFontDescriptor desc;
memset(&lp, 0, sizeof (uiDrawTextLayoutParams));
lp.String = attrstr;
uiFontButtonFont(fontButton, &desc);
lp.DefaultFont = &desc;
lp.Width = p->AreaWidth;
lp.Align = uiDrawTextAlignLeft;
layout = uiDrawNewTextLayout(&lp);
uiDrawText(p->Context, layout, 0, 0);
uiDrawFreeTextLayout(layout);
}
static void handlerMouseEvent(uiAreaHandler *a, uiArea *area, uiAreaMouseEvent *e)
{
// do nothing
}
static void handlerMouseCrossed(uiAreaHandler *ah, uiArea *a, int left)
{
// do nothing
}
static void handlerDragBroken(uiAreaHandler *ah, uiArea *a)
{
// do nothing
}
static int handlerKeyEvent(uiAreaHandler *ah, uiArea *a, uiAreaKeyEvent *e)
{
// reject all keys
return 0;
}
static int onClosing(uiWindow *w, void *data)
{
// TODO change the others to be like this? (the others destroy here rather than later)
// TODO move this below uiQuit()?
uiControlHide(uiControl(w));
uiQuit();
return 0;
}
static int shouldQuit(void *data)
{
uiControlDestroy(uiControl(mainwin));
return 1;
}
int main(void)
{
uiInitOptions o;
const char *err;
uiGrid *grid;
uiBox *vbox;
handler.Draw = handlerDraw;
handler.MouseEvent = handlerMouseEvent;
handler.MouseCrossed = handlerMouseCrossed;
handler.DragBroken = handlerDragBroken;
handler.KeyEvent = handlerKeyEvent;
memset(&o, 0, sizeof (uiInitOptions));
err = uiInit(&o);
if (err != NULL) {
fprintf(stderr, "error initializing ui: %s\n", err);
uiFreeInitError(err);
return 1;
}
uiOnShouldQuit(shouldQuit, NULL);
// TODO 800x600? the size of the GTK+ example?
mainwin = uiNewWindow("libui OpenType Features Example", 640, 480, 1);
uiWindowSetMargined(mainwin, 1);
uiWindowOnClosing(mainwin, onClosing, NULL);
grid = uiNewGrid();
uiGridSetPadded(grid, 1);
uiWindowSetChild(mainwin, uiControl(grid));
fontButton = uiNewFontButton();
uiGridAppend(grid, uiControl(fontButton),
0, 0, 1, 1,
// TODO are these Y values correct?
0, uiAlignFill, 0, uiAlignCenter);
textEntry = uiNewEntry();
uiEntrySetText(textEntry, "afford afire aflight");
uiGridAppend(grid, uiControl(textEntry),
1, 0, 1, 1,
// TODO are these Y values correct too?
// TODO add a baseline align? or a form align?
1, uiAlignFill, 0, uiAlignCenter);
vbox = uiNewVerticalBox();
uiBoxSetPadded(vbox, 1);
uiGridAppend(grid, uiControl(vbox),
0, 1, 1, 1,
0, uiAlignFill, 1, uiAlignFill);
nullFeatures = uiNewCheckbox("NULL uiOpenTypeFeatures");
uiBoxAppend(vbox, uiControl(nullFeatures), 0);
// TODO separator (if other stuff isn't a tab)
// TODO other stuff
area = uiNewArea(&handler);
uiGridAppend(grid, uiControl(area),
1, 1, 1, 1,
1, uiAlignFill, 1, uiAlignFill);
// and set up the initial draw
remakeAttrStr();
uiControlShow(uiControl(mainwin));
uiMain();
uiControlDestroy(uiControl(mainwin));
uiFreeAttributedString(attrstr);
uiUninit();
return 0;
}