dom/html/nsIFormControl.h
author Nicholas Nethercote <nnethercote@mozilla.com>
Fri, 03 Mar 2017 15:32:11 +1100
changeset 374836 4e196d802c7be7f3a3c147cc6c5b6406656584b1
parent 354586 5122a14c6fe6215a3f8184adc9ffd5fb6783da81
permissions -rw-r--r--
Bug 1344118 - Fix the profiler's sleeping threads optimization. r=jseward. When ProfilerBuffer::reset() is called, DuplicateLastSample() will start failing for all sleeping threads because there will be no prior thread data in the buffer to duplicate. But the sampling loop doesn't detect such failure. This causes two problems: - Missing samples. - CPU usage goes through the roof, because each time around the sampling loop the length of the failing search increases. The fix is simple: detect failure in the sampling loop and do a normal sample in that case. The patch also removes ThreadInfo::DuplicateLastSample(), because it just calls onto ProfileBuffer::DuplicateLastSample().

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsIFormControl_h___
#define nsIFormControl_h___

#include "mozilla/EventForwards.h"
#include "nsISupports.h"

class nsIDOMHTMLFormElement;
class nsPresState;

namespace mozilla {
namespace dom {
class Element;
class HTMLFieldSetElement;
class HTMLFormSubmission;
} // namespace dom
} // namespace mozilla

enum FormControlsTypes {
  NS_FORM_FIELDSET = 1,
  NS_FORM_OUTPUT,
  NS_FORM_SELECT,
  NS_FORM_TEXTAREA,
  NS_FORM_OBJECT,
  eFormControlsWithoutSubTypesMax,
  // After this, all types will have sub-types which introduce new enum lists.
  // eFormControlsWithoutSubTypesMax let us know if the previous types values
  // are not overlapping with sub-types/masks.

  // Elements with different types, the value is used as a mask.
  // When changing the order, adding or removing elements, be sure to update
  // the static_assert checks accordingly.
  NS_FORM_BUTTON_ELEMENT = 0x40, // 0b01000000
  NS_FORM_INPUT_ELEMENT  = 0x80  // 0b10000000
};

enum ButtonElementTypes : uint8_t {
  NS_FORM_BUTTON_BUTTON = NS_FORM_BUTTON_ELEMENT + 1,
  NS_FORM_BUTTON_RESET,
  NS_FORM_BUTTON_SUBMIT,
  eButtonElementTypesMax
};

enum InputElementTypes : uint8_t {
  NS_FORM_INPUT_BUTTON = NS_FORM_INPUT_ELEMENT + 1,
  NS_FORM_INPUT_CHECKBOX,
  NS_FORM_INPUT_COLOR,
  NS_FORM_INPUT_DATE,
  NS_FORM_INPUT_EMAIL,
  NS_FORM_INPUT_FILE,
  NS_FORM_INPUT_HIDDEN,
  NS_FORM_INPUT_RESET,
  NS_FORM_INPUT_IMAGE,
  NS_FORM_INPUT_MONTH,
  NS_FORM_INPUT_NUMBER,
  NS_FORM_INPUT_PASSWORD,
  NS_FORM_INPUT_RADIO,
  NS_FORM_INPUT_SEARCH,
  NS_FORM_INPUT_SUBMIT,
  NS_FORM_INPUT_TEL,
  NS_FORM_INPUT_TEXT,
  NS_FORM_INPUT_TIME,
  NS_FORM_INPUT_URL,
  NS_FORM_INPUT_RANGE,
  NS_FORM_INPUT_WEEK,
  NS_FORM_INPUT_DATETIME_LOCAL,
  eInputElementTypesMax
};

static_assert(static_cast<uint32_t>(eFormControlsWithoutSubTypesMax) <
              static_cast<uint32_t>(NS_FORM_BUTTON_ELEMENT),
              "Too many FormControlsTypes without sub-types");
static_assert(static_cast<uint32_t>(eButtonElementTypesMax) <
              static_cast<uint32_t>(NS_FORM_INPUT_ELEMENT),
              "Too many ButtonElementTypes");
static_assert(static_cast<uint32_t>(eInputElementTypesMax) < 1<<8,
              "Too many form control types");

#define NS_IFORMCONTROL_IID   \
{ 0x4b89980c, 0x4dcd, 0x428f, \
  { 0xb7, 0xad, 0x43, 0x5b, 0x93, 0x29, 0x79, 0xec } }

/**
 * Interface which all form controls (e.g. buttons, checkboxes, text,
 * radio buttons, select, etc) implement in addition to their dom specific
 * interface.
 */
class nsIFormControl : public nsISupports
{
public:

  NS_DECLARE_STATIC_IID_ACCESSOR(NS_IFORMCONTROL_IID)

  /**
   * Get the fieldset for this form control.
   * @return the fieldset
   */
  virtual mozilla::dom::HTMLFieldSetElement *GetFieldSet() = 0;

  /**
   * Get the form for this form control.
   * @return the form
   */
  virtual mozilla::dom::Element *GetFormElement() = 0;

  /**
   * Set the form for this form control.
   * @param aForm the form.  This must not be null.
   *
   * @note that when setting the form the control is not added to the
   * form.  It adds itself when it gets bound to the tree thereafter,
   * so that it can be properly sorted with the other controls in the
   * form.
   */
  virtual void SetForm(nsIDOMHTMLFormElement* aForm) = 0;

  /**
   * Tell the control to forget about its form.
   *
   * @param aRemoveFromForm set false if you do not want this element removed
   *        from the form.  (Used by nsFormControlList::Clear())
   */
  virtual void ClearForm(bool aRemoveFromForm) = 0;

  /**
   * Get the type of this control as an int (see NS_FORM_* above)
   * @return the type of this control
   */
  NS_IMETHOD_(uint32_t) GetType() const = 0 ;

  /**
   * Reset this form control (as it should be when the user clicks the Reset
   * button)
   */
  NS_IMETHOD Reset() = 0;

  /**
   * Tells the form control to submit its names and values to the form
   * submission object
   * @param aFormSubmission the form submission to notify of names/values/files
   *                       to submit
   */
  NS_IMETHOD
  SubmitNamesValues(mozilla::dom::HTMLFormSubmission* aFormSubmission) = 0;

  /**
   * Save to presentation state.  The form control will determine whether it
   * has anything to save and if so, create an entry in the layout history for
   * its pres context.
   */
  NS_IMETHOD SaveState() = 0;

  /**
   * Restore from presentation state.  You pass in the presentation state for
   * this form control (generated with GenerateStateKey() + "-C") and the form
   * control will grab its state from there.
   *
   * @param aState the pres state to use to restore the control
   * @return true if the form control was a checkbox and its
   *         checked state was restored, false otherwise.
   */
  virtual bool RestoreState(nsPresState* aState) = 0;

  virtual bool AllowDrop() = 0;

  /**
   * Returns whether this is a control which submits the form when activated by
   * the user.
   * @return whether this is a submit control.
   */
  inline bool IsSubmitControl() const;

  /**
   * Returns whether this is a text control.
   * @param  aExcludePassword  to have NS_FORM_INPUT_PASSWORD returning false.
   * @return whether this is a text control.
   */
  inline bool IsTextControl(bool aExcludePassword) const;

  /**
   * Returns true if this is a text control or a number control.
   * @param  aExcludePassword  to have NS_FORM_INPUT_PASSWORD returning false.
   * @return true if this is a text control or a number control.
   */
  inline bool IsTextOrNumberControl(bool aExcludePassword) const;

  /**
   * Returns whether this is a single line text control.
   * @param  aExcludePassword  to have NS_FORM_INPUT_PASSWORD returning false.
   * @return whether this is a single line text control.
   */
  inline bool IsSingleLineTextControl(bool aExcludePassword) const;

  /**
   * Returns whether this is a submittable form control.
   * @return whether this is a submittable form control.
   */
  inline bool IsSubmittableControl() const;

  /**
   * Returns whether this form control can have draggable children.
   * @return whether this form control can have draggable children.
   */
  inline bool AllowDraggableChildren() const;

  virtual bool IsDisabledForEvents(mozilla::EventMessage aMessage)
  {
    return false;
  }
protected:

  /**
   * Returns whether mType corresponds to a single line text control type.
   * @param aExcludePassword to have NS_FORM_INPUT_PASSWORD ignored.
   * @param aType the type to be tested.
   * @return whether mType corresponds to a single line text control type.
   */
  inline static bool IsSingleLineTextControl(bool aExcludePassword, uint32_t aType);

  /**
   * Returns whether this is a auto-focusable form control.
   * @return whether this is a auto-focusable form control.
   */
  inline bool IsAutofocusable() const;
};

bool
nsIFormControl::IsSubmitControl() const
{
  uint32_t type = GetType();
  return type == NS_FORM_INPUT_SUBMIT ||
         type == NS_FORM_INPUT_IMAGE ||
         type == NS_FORM_BUTTON_SUBMIT;
}

bool
nsIFormControl::IsTextControl(bool aExcludePassword) const
{
  uint32_t type = GetType();
  return type == NS_FORM_TEXTAREA ||
         IsSingleLineTextControl(aExcludePassword, type);
}

bool
nsIFormControl::IsTextOrNumberControl(bool aExcludePassword) const
{
  return IsTextControl(aExcludePassword) || GetType() == NS_FORM_INPUT_NUMBER;
}

bool
nsIFormControl::IsSingleLineTextControl(bool aExcludePassword) const
{
  return IsSingleLineTextControl(aExcludePassword, GetType());
}

/*static*/
bool
nsIFormControl::IsSingleLineTextControl(bool aExcludePassword, uint32_t aType)
{
  return aType == NS_FORM_INPUT_TEXT ||
         aType == NS_FORM_INPUT_EMAIL ||
         aType == NS_FORM_INPUT_SEARCH ||
         aType == NS_FORM_INPUT_TEL ||
         aType == NS_FORM_INPUT_URL ||
         // TODO: those are temporary until bug 773205 is fixed.
#if defined(MOZ_WIDGET_ANDROID) || defined(MOZ_WIDGET_GONK)
         // On Android/B2G, date/time input appears as a normal text box.
         aType == NS_FORM_INPUT_TIME ||
         aType == NS_FORM_INPUT_DATE ||
#endif
         aType == NS_FORM_INPUT_MONTH ||
         aType == NS_FORM_INPUT_WEEK ||
         aType == NS_FORM_INPUT_DATETIME_LOCAL ||
         (!aExcludePassword && aType == NS_FORM_INPUT_PASSWORD);
}

bool
nsIFormControl::IsSubmittableControl() const
{
  // TODO: keygen should be in that list, see bug 101019.
  uint32_t type = GetType();
  return type == NS_FORM_OBJECT ||
         type == NS_FORM_TEXTAREA ||
         type == NS_FORM_SELECT ||
         // type == NS_FORM_KEYGEN ||
         type & NS_FORM_BUTTON_ELEMENT ||
         type & NS_FORM_INPUT_ELEMENT;
}

bool
nsIFormControl::AllowDraggableChildren() const
{
  uint32_t type = GetType();
  return type == NS_FORM_OBJECT ||
         type == NS_FORM_FIELDSET ||
         type == NS_FORM_OUTPUT;
}

bool
nsIFormControl::IsAutofocusable() const
{
  uint32_t type = GetType();
  return type & NS_FORM_INPUT_ELEMENT ||
         type & NS_FORM_BUTTON_ELEMENT ||
         type == NS_FORM_TEXTAREA ||
         type == NS_FORM_SELECT;
}

NS_DEFINE_STATIC_IID_ACCESSOR(nsIFormControl, NS_IFORMCONTROL_IID)

#endif /* nsIFormControl_h___ */